diff --git a/docs/guide/extensions.md b/docs/guide/extensions.md
index d1fcb00..1f877e6 100644
--- a/docs/guide/extensions.md
+++ b/docs/guide/extensions.md
@@ -36,6 +36,8 @@ using the following syntax: e.g. `[[name()]]`, `[[name\space\MyClass::name()]]`.
         "psr-0": { "vendor\\package\\": "./src" }
     },
     ```
+    
+    Details about autoloading configuration can be found in the [composer documentation](http://getcomposer.org/doc/04-schema.md#autoload).