diff --git a/index.js b/index.js
index 0c8566c..2a2861e 100644
--- a/index.js
+++ b/index.js
@@ -58,6 +58,7 @@ export default class MyWebView extends Component {
   }
 
   _onMessage(e) {
+    if (this.props.onMessage) this.props.onMessage();
     this.setState({
       webViewHeight: parseInt(e.nativeEvent.data)
     });