update 2.4 release notes
diff --git a/release-notes/VERSION b/release-notes/VERSION
index f20aa7f..9a18db0 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -3,6 +3,8 @@
#506: Index is never set for Collection and Array in InvalidFormatException.Reference
(reported by Fabrice D, fabdouglas@github)
+#515: Mixin annotations lost when using a mixin class hierarchy with non-mixin interfaces
+ (reported by 'stevebread@github')
- Fixed a problem related to [jackson-dataformat-smile#19].
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