diff --git a/README.md b/README.md
index fff88e9..449f363 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ supplying a `parsedToken` (with all its information in visible form) and the
 
 ```js
 passport.use(new AppleTokenStrategy({
-      clientID: 'apple_client_id', // Specify the CLIENT_ID of the app that accesses the backend
+      clientId: 'apple_client_id', // Specify the CLIENT_ID of the app that accesses the backend
       // Or, if multiple clients access the backend: [CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3]
       appleIdKeysUrl?: 'https://appleid.apple.com/auth/keys', // OPTIONAL: Specify the url to get Apple auth keys
       passReqToCallback?: false, // OPTIONAL: Specify if the request is passed to callback
diff --git a/src/strategy.ts b/src/strategy.ts
index 2df7baa..271a4f1 100644
--- a/src/strategy.ts
+++ b/src/strategy.ts
@@ -33,7 +33,7 @@ type Options = {
  * Examples:
  *
  * passport.use(new AppleTokenStrategy({
- *     clientID: 'apple_client_id', // Specify the CLIENT_ID of the app that accesses the backend
+ *     clientId: 'apple_client_id', // Specify the CLIENT_ID of the app that accesses the backend
  *     // Or, if multiple clients access the backend:
  *     //[CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3]
  *     appleIdKeysUrl?: 'https://appleid.apple.com/auth/keys', // OPTIONAL: Specify the url to get Apple auth keys
@@ -72,7 +72,7 @@ export class AppleTokenStrategy extends Strategy {
     }
 
     if(!options.clientId) {
-      throw new Error('AppleVerifyTokenStrategy requires a ClientID');
+      throw new Error('AppleVerifyTokenStrategy requires a clientId');
     }
 
     this.appleIdKeysUrl = options.appleIdKeysUrl || 'https://appleid.apple.com/auth/keys';