--- a/doc/book/devrepo/datamodel/definition.rst	Sat Feb 08 22:20:45 2020 +0100
+++ b/doc/book/devrepo/datamodel/definition.rst	Sat Feb 15 17:08:15 2020 +0100
@@ -466,7 +466,7 @@
     __permissions__ = {'read': ('managers', 'users'),
                        'add': ('managers', RRQLExpression('U has_update_permission S')),
                        'delete': ('managers', RRQLExpression('U has_update_permission S'))
-		       }
+                       }
 
 In the above example, user will be allowed to add/delete `my_relation` if he has
 the `update` permission on the subject of the relation.