diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 9df6a12fcb1..ef5bdd05cf4 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -200,6 +200,8 @@ Release 0.23.1 - Unreleased
     HADOOP-7890. Redirect hadoop script's deprecation message to stderr.
     (Koji Knoguchi via mahadev)
 
+    HADOOP-7504. Add the missing Ganglia31 opts to hadoop-metrics.properties as a comment. (harsh)
+
   OPTIMIZATIONS
 
   BUG FIXES
diff --git a/hadoop-common-project/hadoop-common/src/main/conf/hadoop-metrics.properties b/hadoop-common-project/hadoop-common/src/main/conf/hadoop-metrics.properties
index baa57bc321a..c1b2eb7645a 100644
--- a/hadoop-common-project/hadoop-common/src/main/conf/hadoop-metrics.properties
+++ b/hadoop-common-project/hadoop-common/src/main/conf/hadoop-metrics.properties
@@ -40,6 +40,7 @@ mapred.class=org.apache.hadoop.metrics.spi.NullContext
 
 # Configuration of the "jvm" context for ganglia
 # jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext
+# jvm.class=org.apache.hadoop.metrics.ganglia.GangliaContext31
 # jvm.period=10
 # jvm.servers=localhost:8649
 
@@ -53,6 +54,7 @@ rpc.class=org.apache.hadoop.metrics.spi.NullContext
 
 # Configuration of the "rpc" context for ganglia
 # rpc.class=org.apache.hadoop.metrics.ganglia.GangliaContext
+# rpc.class=org.apache.hadoop.metrics.ganglia.GangliaContext31
 # rpc.period=10
 # rpc.servers=localhost:8649
 
@@ -67,6 +69,7 @@ ugi.class=org.apache.hadoop.metrics.spi.NullContext
 
 # Configuration of the "ugi" context for ganglia
 # ugi.class=org.apache.hadoop.metrics.ganglia.GangliaContext
+# ugi.class=org.apache.hadoop.metrics.ganglia.GangliaContext31
 # ugi.period=10
 # ugi.servers=localhost:8649