diff --git a/README.md b/README.md
index c84de44..a786d98 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 011] The variable description](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 012] 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 012] A default value
+# [tutorial 013] A variable with type "choice"
 
-[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
@@ -22,6 +22,13 @@
 ---
 proxy_mode:
   description: Configure Proxy Access to the Internet
+  type: choice
+  choices:
+    - No proxy
+    - Auto-detect proxy settings for this network
+    - Use system proxy settings
+    - Manual proxy configuration
+    - Automatic proxy configuration URL
   default: No proxy
 
 ```
@@ -32,9 +39,9 @@ foo@bar:~$ rougail -v 1.1 -m firefox/ -o doc -do github
 ```
 ### Variables
 
-| Variable                                                                                          | Description                                                                                       |
-|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **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                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+| 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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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/>[`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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
 
 
 ## User data
@@ -125,14 +132,17 @@ proxy_mode: foo
 ```console
 foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/04/config.yaml
 ```
-<pre>╭────────────────────────── Caption ──────────────────────────╮
+<pre>🛑 ERRORS
+<span style="color: #ff0000">┗━━ </span>"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 configuration", "No proxy" and "Use system 
+<span style="color: #ff0000">    </span>proxy settings" are allowed
+╭────────────────────────── Caption ──────────────────────────╮
 │ Variable                           <span style="color: #ffd700">Default value</span>            │
 │ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
 │ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
 │ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
 ╰─────────────────────────────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: foo (<span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
 </pre>
 ### Example 5
 
@@ -150,7 +160,8 @@ proxy_mode: 1
 foo@bar:~$ rougail -v 1.1 -m firefox/ -u file -ff config/05/config.yaml
 ```
 <pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"1" is an invalid string for "proxy_mode (Configure Proxy Access to the Internet)"
+<span style="color: #ff0000">┗━━ </span>"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 configuration", "No proxy" and "Use system 
+<span style="color: #ff0000">    </span>proxy settings" are allowed
 ╭────────────────────────── Caption ──────────────────────────╮
 │ Variable                           <span style="color: #ffd700">Default value</span>            │
 │ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
@@ -162,4 +173,4 @@ Variables:
 </pre>
 
 
-- [[tutorial 013] A variable with type "choice"](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 014] Choice type is optional](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_014/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_014~1..v1.1_014))
diff --git a/config/04/output_ro.html b/config/04/output_ro.html
index 55d31f3..c182f7d 100644
--- a/config/04/output_ro.html
+++ b/config/04/output_ro.html
@@ -1,9 +1,12 @@
-<pre>╭────────────────────────── Caption ──────────────────────────╮
+<pre>🛑 ERRORS
+<span style="color: #ff0000">┗━━ </span>"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 configuration", "No proxy" and "Use system 
+<span style="color: #ff0000">    </span>proxy settings" are allowed
+╭────────────────────────── Caption ──────────────────────────╮
 │ Variable                           <span style="color: #ffd700">Default value</span>            │
 │ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │
 │ <span style="color: #ff0000">Undocumented but modified variable</span> (<span style="color: #00aa00">Original default value</span>) │
 │ <span style="color: #ffaf00">Unmodifiable variable</span>                                       │
 ╰─────────────────────────────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: foo (<span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: <span style="color: #ffd700">No proxy</span>
 </pre>
diff --git a/config/05/output_ro.html b/config/05/output_ro.html
index bf39385..874be61 100644
--- a/config/05/output_ro.html
+++ b/config/05/output_ro.html
@@ -1,5 +1,6 @@
 <pre>🛑 ERRORS
-<span style="color: #ff0000">┗━━ </span>"1" is an invalid string for "proxy_mode (Configure Proxy Access to the Internet)"
+<span style="color: #ff0000">┗━━ </span>"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 configuration", "No proxy" and "Use system 
+<span style="color: #ff0000">    </span>proxy settings" are allowed
 ╭────────────────────────── Caption ──────────────────────────╮
 │ Variable                           <span style="color: #ffd700">Default value</span>            │
 │ <span style="color: #5c5cff">Undocumented variable</span>              Modified value           │