diff --git a/README.md b/README.md
index e67ce02..67f6ca1 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,12 @@ ReactDOM.render(<Rcslider />, container);
           <td>''</td>
           <td>Set the animation for tooltip if it shows.</td>
         </tr>
+        <tr>
+          <td>tipFormatter</td>
+          <td>func</td>
+          <td></td>
+          <td>Format the value of the tooltip if it shows.</td>
+        </tr>
         <tr>
           <td>dots</td>
           <td>bool</td>
diff --git a/package.json b/package.json
index da51092..54a941a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rc-slider",
-  "version": "2.2.0",
+  "version": "2.2.1",
   "description": "slider ui component for react",
   "keywords": [
     "react",