Fix #1125
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 7447d39..df821b2 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -6,6 +6,7 @@
 
 2.7.3 (not yet released)
 
+#1125: Problem with polymorphic types, losing properties from base type(s)
 #1150: Problem with Object id handling, explicit `null` token
  (reported by Xavi T)