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 ab9743cffc..89f7c5d5da 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
@@ -165,7 +165,7 @@ static class ScanInfoPerBlockPool extends
     /**
      * Merges {@code that} ScanInfoPerBlockPool into this one
      *
-     * @param the ScanInfoPerBlockPool to merge
+     * @param that ScanInfoPerBlockPool to merge
      */
     public void addAll(ScanInfoPerBlockPool that) {
       if (that == null) return;