diff --git a/maker/golang/xdb/maker.go b/maker/golang/xdb/maker.go
index b2d1cfa..9935aef 100644
--- a/maker/golang/xdb/maker.go
+++ b/maker/golang/xdb/maker.go
@@ -37,13 +37,13 @@
 //
 // data entry structure:
 // +--------------------+-----------------------+
-// | 2bytes (for desc)	| dynamic length		|
+// | 2bytes (for desc)	| dynamic length        |
 // +--------------------+-----------------------+
 //  data length   whatever in bytes
 //
 // 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 f511853..5e3a9d6 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
@@ -39,13 +39,13 @@
 //
 // data entry structure:
 // +--------------------+-----------------------+
-// | 2bytes (for desc)	| dynamic length		|
+// | 2bytes (for desc)	| dynamic length        |
 // +--------------------+-----------------------+
 //  data length   whatever in bytes
 //
 // index entry structure
 // +------------+-----------+---------------+------------+
-// | 4bytes		| 4bytes	| 2bytes		| 4 bytes    |
+// | 4bytes		| 4bytes	| 2bytes        | 4 bytes    |
 // +------------+-----------+---------------+------------+
 //  start ip 	  end ip	  data length     data ptr