diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 046ddee06e2..ef91789048d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -106,6 +106,9 @@ Release 2.0.3-alpha - Unreleased
     HDFS-4143. Change blocks to private in INodeFile and renames isLink() to
     isSymlink() in INode. (szetszwo)
 
+    HDFS-4046. Rename ChecksumTypeProto enum NULL since it is illegal in
+    C/C++. (Binglin Chang via suresh)
+
   OPTIMIZATIONS
 
   BUG FIXES