diff --git a/docs/tutorial/customtype.rst b/docs/tutorial/customtype.rst
index 4ccd4d8cc..66d585e56 100644
--- a/docs/tutorial/customtype.rst
+++ b/docs/tutorial/customtype.rst
@@ -235,12 +235,27 @@ With this use of a type, it is possible to define our HTTPS and SOCKS Proxy in a
           default: v5
     ...
 
+In the `socks_proxy` family definition, we can see that we have added a new variable,
+the `version` variable:
+
+.. code-block:: yaml
+
+    version:
+      description: SOCKS host version used by proxy
+      choices:
+        - v4
+        - v5
+      default: v5
+
+You can see that the type definition here is flexible : it is perfectly possible 
+to add to what has been defined in the type. 
+The type definition is therefore not only a template but much more an extensible schema.
 
 .. keypoints:: Key points
 
-   - type declaration
+   - the very practical aspects of type declaration
    - type usage 
    - more conscious family definition
-   - the very practical aspects of type declaration
+   - using a type for an extended family definition
    
    We have seen how the definition of type, used effectively, allows for a new expressiveness.