diff --git a/en/reference/inheritance-mapping.rst b/en/reference/inheritance-mapping.rst
index 6128b7a4c..c4e76c531 100644
--- a/en/reference/inheritance-mapping.rst
+++ b/en/reference/inheritance-mapping.rst
@@ -18,7 +18,11 @@ appear in the middle of an otherwise mapped inheritance hierarchy
 
     A mapped superclass cannot be an entity, it is not query-able and
     persistent relationships defined by a mapped superclass must be
-    unidirectional. For further support of inheritance, the single or
+    unidirectional (with an owning side only). This means that One-To-Many
+    assocations are not possible on a mapped superclass at all.
+    Furthermore Many-To-Many associations are only possible if the
+    mapped superclass is only used in exactly one entity at the moment.
+    For further support of inheritance, the single or
     joined table inheritance features have to be used.