diff --git a/docs/usage.md b/docs/usage.md
index bf14ff14..dfb7e4d1 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -218,10 +218,10 @@ unsubscribe();
 
 ### `onWillClose(callback)`
 
-A callback which will be called when Webamp is _about to_ closed. Returns an "unsubscribe" function. The callback will be passed a `cancel` function which you can use to conditionally prevent Webamp from being closed.
+A callback which will be called when Webamp is _about to_ close. Returns an "unsubscribe" function. The callback will be passed a `cancel` function which you can use to conditionally prevent Webamp from being closed.
 
 ```JavaScript
-const unsubscribe = webamp.onClose((cancel) => {
+const unsubscribe = webamp.onWillClose((cancel) => {
     if (!window.confirm("Are you sure you want to close Webamp?")) {
         cancel();
     }
diff --git a/index.d.ts b/index.d.ts
index 48a580a8..75491739 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -161,7 +161,7 @@ export default class Webamp {
   public onTrackDidChange(callback: (track: Track) => any): () => void;
 
   /**
-   * A callback which will be called when Webamp is _about to_ closed. Returns an
+   * A callback which will be called when Webamp is _about to_ close. Returns an
    * "unsubscribe" function. The callback will be passed a `cancel` function
    * which you can use to conditionally prevent Webamp from being closed.
    *