diff --git a/schema.py b/schema.py
index f07b45f9ae8e9c2ecfd4b34c26b476f966bdec28_c2NoZW1hLnB5..3843fec2b5c949fa447f51e4370d535c07010ced_c2NoZW1hLnB5 100644
--- a/schema.py
+++ b/schema.py
@@ -13,4 +13,4 @@
     content_format = String(meta=True, internationalizable=True, maxsize=50,
                             default='text/rest', constraints=[format_constraint])
     content = String(required=True, fulltextindexed=True)
-    entry_of = SubjectRelation('Blog', cardinality='?*')
+    entry_of = SubjectRelation('Blog', cardinality='**')