diff --git a/History.md b/History.md
index 9ccf8e4..cd0b434 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,7 @@
+0.0.3 / 2017-03-17
+==================
+  * Optimise String extend function.
+
 0.0.1 / 2017-02-28
 ==================
   * Initial release
\ No newline at end of file
diff --git a/lib/string.js b/lib/string.js
index 0aef816..6827117 100644
--- a/lib/string.js
+++ b/lib/string.js
@@ -36,8 +36,8 @@ if(!String.prototype.splice){
                 }else{
                     len -= 0;
 
-                    let strl = this.slice(0, start)
-                    let strr = this.slice(start + len)
+                    let strl = this.slice(0, start),
+                        strr = this.slice(start + len);
 
                     return strl + fill + strr
                 }
diff --git a/package.json b/package.json
index bd737ef..4f8f6ba 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "es.shim",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Some shim api that let you can use in all node.js environment",
   "keyworks": [
     "es5",