diff --git a/packages-exp/auth-exp/index.ts b/packages-exp/auth-exp/index.ts
index b9d74996b7f..94458cf6fbb 100644
--- a/packages-exp/auth-exp/index.ts
+++ b/packages-exp/auth-exp/index.ts
@@ -121,7 +121,8 @@ export { browserPopupRedirectResolver } from './src/platform_browser/popup_redir
 export { PhoneMultiFactorGenerator } from './src/platform_browser/mfa/assertions/phone';
 
 /**
- * Initializes an Auth instance with platform specific default dependencies.
+ * Returns the Auth instance associated with the provided {@link @firebase/app#FirebaseApp}.
+ * If no instance exists, initializes an Auth instance with platform-specific default dependencies.
  *
  * @param app - The Firebase App.
  *