diff --git a/storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileBlackHoleWriter.java b/storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileBlackHoleWriter.java
index 090d4d6a2e..ba1f07c80c 100644
--- a/storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileBlackHoleWriter.java
+++ b/storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileBlackHoleWriter.java
@@ -25,7 +25,7 @@
 import org.apache.uniffle.storage.api.FileWriter;
 import org.apache.uniffle.storage.common.FileBasedShuffleSegment;
 
-/** A shuffle writer that write data into black hole. */
+/** A shuffle writer that write data into black hole for performance test purpose only. */
 public class LocalFileBlackHoleWriter implements FileWriter {
 
   private long nextOffset;