Fix #580
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 671851b..fa38ccb 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -8,6 +8,8 @@
 
 (jackson-core)#158: Setter confusion on assignable types
  (reported by tsquared2763@github)
+#580: delegate deserializers choke on a (single) abstract/polymorphic parameter
+ (reported by Ian B, tea-dragon@github)
 
 2.4.3 (02-Oct-2014)