diff --git a/README.md b/README.md
index 0793532..0df7560 100644
--- a/README.md
+++ b/README.md
@@ -283,8 +283,21 @@ class Hello extends React.Component<Props, State> {
     this.state = { currentEnthusiasm: props.enthusiasmLevel || 1 };
   }
 
-  onIncrement = () => this.updateEnthusiasm(this.state.currentEnthusiasm + 1);
-  onDecrement = () => this.updateEnthusiasm(this.state.currentEnthusiasm - 1);
+  onIncrement = () => {
+    this.setState(nextState => {
+      return {
+        currentEnthusiasm: nextState.currentEnthusiasm + 1
+      };
+    });
+  }
+
+  onDecrement = () => {
+    this.setState(nextState => {
+      return {
+        currentEnthusiasm: nextState.currentEnthusiasm - 1
+      };
+    });
+  }
 
   render() {
     const { name } = this.props;
@@ -303,10 +316,6 @@ class Hello extends React.Component<Props, State> {
       </div>
     );
   }
-
-  updateEnthusiasm(currentEnthusiasm: number) {
-    this.setState({ currentEnthusiasm });
-  }
 }
 
 export default Hello;