diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocol.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocol.java
index 59b724b1c9..1bea46f89a 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocol.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocol.java
@@ -104,6 +104,7 @@ public void journal(RequestInfo reqInfo,
   
   /**
    * Start writing to a new log segment on the JournalNode.
+   * NameNode 发送命令让 JournalNode 开启一个新的日志段 LogSegment
    * Before calling this, one should finalize the previous segment
    * using {@link #finalizeLogSegment(RequestInfo, long, long)}.
    *