diff --git a/maker/golang/xdb/maker.go b/maker/golang/xdb/maker.go
index 9935aef2..36ddaea3 100644
--- a/maker/golang/xdb/maker.go
+++ b/maker/golang/xdb/maker.go
@@ -43,7 +43,7 @@
 //
 // index entry structure
 // +------------+-----------+---------------+------------+
-// | 4bytes		| 4bytes	| 2bytes        | 4 bytes    |
+// | 4bytes     | 4bytes    | 2bytes        | 4 bytes    |
 // +------------+-----------+---------------+------------+
 //  start ip 	  end ip	  data length     data ptr
 
diff --git a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Maker.java b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Maker.java
index 5e3a9d61..496109c7 100644
--- a/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Maker.java
+++ b/maker/java/src/main/java/org/lionsoul/ip2region/xdb/Maker.java
@@ -45,7 +45,7 @@
 //
 // index entry structure
 // +------------+-----------+---------------+------------+
-// | 4bytes		| 4bytes	| 2bytes        | 4 bytes    |
+// | 4bytes     | 4bytes    | 2bytes        | 4 bytes    |
 // +------------+-----------+---------------+------------+
 //  start ip 	  end ip	  data length     data ptr