diff --git a/lucene/misc/src/java/org/apache/lucene/store/NativeUnixDirectory.java b/lucene/misc/src/java/org/apache/lucene/store/NativeUnixDirectory.java
index fe9510757c8..817b5620a89 100644
--- a/lucene/misc/src/java/org/apache/lucene/store/NativeUnixDirectory.java
+++ b/lucene/misc/src/java/org/apache/lucene/store/NativeUnixDirectory.java
@@ -73,7 +73,7 @@ public class NativeUnixDirectory extends FSDirectory {
   private final static long ALIGN = 512;
   private final static long ALIGN_NOT_MASK = ~(ALIGN-1);
   
-  /** Default buffer size before writing to disk (256 MB);
+  /** Default buffer size before writing to disk (256 KB);
    *  larger means less IO load but more RAM and direct
    *  buffer storage space consumed during merging. */