diff --git a/Documentation/Books/Users/AqlExtending/Conventions.mdpp b/Documentation/Books/Users/AqlExtending/Conventions.mdpp
index 60630a38c6..8ee543b0d3 100644
--- a/Documentation/Books/Users/AqlExtending/Conventions.mdpp
+++ b/Documentation/Books/Users/AqlExtending/Conventions.mdpp
@@ -117,7 +117,9 @@ Any violation of the strict mode will trigger a runtime error.
 
 Internally, user functions are stored in a system collection named
 *_aqlfunctions*  of the selected database. 
-That means that by default they are excluded from dumps
-created with [arangodump](../HttpBulkImports/Arangodump.md).
-To include AQL user functions in a dump, the dump should be started
-with the option *--include-system-collections true*.
+Documents in this collection should not be accessed directly, but 
+only via the dedicated interfaces.
+Also system collection are excluded from dumps created with 
+[arangodump](../HttpBulkImports/Arangodump.md). To include AQL user 
+functions in a dump, the dump should be started with the 
+option *--include-system-collections true*.