Fixed #691
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 7031bbc..f400c2d 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -4,6 +4,11 @@
 === Releases ===
 ------------------------------------------------------------------------
 
+2.5.2 (not yet released)
+
+#691: Jackson 2.5.0. NullSerializer for MapProperty failing
+ (reported by Antibrumm@github)
+
 2.5.1 (06-Feb-2015)
 
 #667: Problem with bogus conflict between single-arg-String vs `CharSequence` constructor