diff --git a/admin_manual/configuration_user/instruction_set_for_groups.rst b/admin_manual/configuration_user/instruction_set_for_groups.rst
index d991b3e4c..9e4ed39ee 100644
--- a/admin_manual/configuration_user/instruction_set_for_groups.rst
+++ b/admin_manual/configuration_user/instruction_set_for_groups.rst
@@ -167,7 +167,7 @@ XML output
   </ocs>  
 
 Edit data of a single group
---------------------------
+---------------------------
 
 Edits attributes related to a group. Authentication
 is done by sending a Basic HTTP Authorization header.