diff --git a/README.md b/README.md
index f8ac1eec..fb4e3d87 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 - [Summary](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/branch/1.1/README.md)
-- [[tutorial v1.1_011] Describe the variable](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_011/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_011~1..v1.1_011))
+- [[tutorial v1.1_012] Set a default value](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_012~1..v1.1_012))
 
-# [tutorial v1.1_012)] Set a default value
+# [tutorial v1.1_013)] The variable is a "choice" variable
 
-[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_012~1..v1.1_012)
+[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_013~1..v1.1_013)
 
 
 ## Screenshot
@@ -23,31 +23,39 @@
 ---
 version: 1.1
 
-proxy_mode: No proxy  # Configure Proxy Access to the Internet
+proxy_mode:
+  description: Configure Proxy Access to the Internet
+  choices:
+    - No proxy
+    - Auto-detect proxy settings for this network
+    - Use system proxy settings
+    - Manual proxy configuration
+    - Automatic proxy configuration URL
+  default: No proxy
 ...
 
 ```
 ### Let's generate the documentation
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -o doc -do github
 ```
 | Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
 |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **proxy_mode**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                    | Configure Proxy Access to the Internet.<br/>**Default**: No proxy                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+| **proxy_mode**<br/>[`choice`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                    | Configure Proxy Access to the Internet.<br/>**Choices**: <br/>- No proxy **← (default)**<br/>- Auto-detect proxy settings for this network<br/>- Use system proxy settings<br/>- Manual proxy configuration<br/>- Automatic proxy configuration URL                                                                                                                                                                                                                                                                                   |
 
 ### Let's generate the changelog
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -o doc --doc.contents changelog -do github
 ```
 #### Modified variable
 
-| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
-|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **proxy_mode**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                    | Configure Proxy Access to the Internet.<br/>**Default**: <ins>No proxy</ins>                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
+|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| **proxy_mode**<br/>~~`string`~~ [<ins>`choice`</ins>](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Configure Proxy Access to the Internet.<br/>**Choices**: <br/>- No proxy **← (default)**<br/>- <ins>Auto-detect proxy settings for this network</ins><br/>- <ins>Use system proxy settings</ins><br/>- <ins>Manual proxy configuration</ins><br/>- <ins>Automatic proxy configuration URL</ins>                                                                                                                                                                                                                                                                                                                                                                                       |
 
 
 ## User datas
@@ -64,7 +72,7 @@ foo@bar:~$ rougail -m firefox/ -o doc --doc.contents changelog -do github
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/01/config.yaml
 ```
 <pre>╭─────── Caption ────────╮
@@ -86,7 +94,7 @@ proxy_mode: No proxy
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/02/config.yaml
 ```
 <pre>╭────────────── Caption ───────────────╮
@@ -109,7 +117,7 @@ proxy_mode: Manual proxy configuration
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/03/config.yaml
 ```
 <pre>╭────────────── Caption ───────────────╮
@@ -132,15 +140,17 @@ proxy_mode: foo
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/04/config.yaml
 ```
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
+<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
+<span style="color: #ffff00">┗━━ </span>the value "foo" is an invalid choice for "proxy_mode" (Configure Proxy Access to the Internet), only "Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
+<span style="color: #ffff00">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed, it will be ignored when loading from the YAML file "config/04/config.yaml"
+╭─────── Caption ────────╮
+│ Variable <span style="color: #ffd700">Default value</span> │
+╰────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: foo ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
 </pre>
 ### Example 5
 
@@ -155,11 +165,12 @@ proxy_mode: 1
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_012
+foo@bar:~$ git switch --detach v1.1_013
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/05/config.yaml
 ```
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>the value "1" is an invalid string for "proxy_mode" (Configure Proxy Access to the Internet), which is not a string, it will be ignored when loading from the YAML file "config/05/config.yaml"
+<span style="color: #ffff00">┗━━ </span>the value "1" is an invalid choice for "proxy_mode" (Configure Proxy Access to the Internet), only "Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
+<span style="color: #ffff00">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭─────── Caption ────────╮
 │ Variable <span style="color: #ffd700">Default value</span> │
 ╰────────────────────────╯
@@ -168,4 +179,4 @@ Variables:
 </pre>
 
 
-- [[tutorial v1.1_013] The variable is a "choice" variable](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_013/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_013~1..v1.1_013))
+- [[tutorial v1.1_020] Group variables inside a family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_020~1..v1.1_020))
diff --git a/config/04/output_ro.html b/config/04/output_ro.html
index 257dbe7e..3b735cce 100644
--- a/config/04/output_ro.html
+++ b/config/04/output_ro.html
@@ -1,7 +1,9 @@
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
+<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
+<span style="color: #ffff00">┗━━ </span>the value "foo" is an invalid choice for "proxy_mode" (Configure Proxy Access to the Internet), only "Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
+<span style="color: #ffff00">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed, it will be ignored when loading from the YAML file "config/04/config.yaml"
+╭─────── Caption ────────╮
+│ Variable <span style="color: #ffd700">Default value</span> │
+╰────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: foo ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
 </pre>
diff --git a/config/05/output_ro.html b/config/05/output_ro.html
index 8ab79d7c..21c747f4 100644
--- a/config/05/output_ro.html
+++ b/config/05/output_ro.html
@@ -1,5 +1,6 @@
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>the value "1" is an invalid string for "proxy_mode" (Configure Proxy Access to the Internet), which is not a string, it will be ignored when loading from the YAML file "config/05/config.yaml"
+<span style="color: #ffff00">┗━━ </span>the value "1" is an invalid choice for "proxy_mode" (Configure Proxy Access to the Internet), only "Auto-detect proxy settings for this network", "Automatic proxy configuration URL", "Manual proxy 
+<span style="color: #ffff00">    </span>configuration", "No proxy" and "Use system proxy settings" are allowed, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭─────── Caption ────────╮
 │ Variable <span style="color: #ffd700">Default value</span> │
 ╰────────────────────────╯
