diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
index 58276e5ccc..352ac81653 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
@@ -141,7 +141,8 @@ public String toString() {
           + ", missing metadata files: " + missingMetaFile
           + ", missing block files: " + missingBlockFile
           + ", missing blocks in memory: " + missingMemoryBlocks
-          + ", mismatched blocks: " + mismatchBlocks;
+          + ", mismatched blocks: " + mismatchBlocks
+          + ", duplicated blocks: " + duplicateBlocks;
     }
   }
 
@@ -391,7 +392,7 @@ private void clear() {
   }
 
   /**
-   * Main program loop for DirectoryScanner. Runs {@link reconcile()} and
+   * Main program loop for DirectoryScanner. Runs {@link #reconcile()} and
    * handles any exceptions.
    */
   @Override