diff --git a/docs/backends.rst b/docs/backends.rst
index a0255e6..878fa7a 100644
--- a/docs/backends.rst
+++ b/docs/backends.rst
@@ -141,6 +141,8 @@ Example
 Active Directory Backend
 ------------------------
 
+.. warning:: This backend needs the **cn** and **unicodePwd** attributes to be declared in attributes.yml
+
 Class path
 ^^^^^^^^^^