Fix #1999
diff --git a/release-notes/VERSION-2.x b/release-notes/VERSION-2.x
index 05d9652..da0a2cb 100644
--- a/release-notes/VERSION-2.x
+++ b/release-notes/VERSION-2.x
@@ -14,6 +14,8 @@
 #1998: Removing "type" attribute with Mixin not taken in account if
   using ObjectMapper.copy()
  (reported by SBKila@github)
+#1999: "Duplicate property" issue should mention which class it complains about
+ (reported by Ondrej Z)
 
 2.9.5 (26-Mar-2018)