diff --git a/src/ima.d.ts b/src/ima.d.ts
index 6bf7108..781c053 100644
--- a/src/ima.d.ts
+++ b/src/ima.d.ts
@@ -425,6 +425,10 @@ export namespace google {
      * This event type is raised by the ad as a notification when the ad state changes and when users interact with the ad. For example, when the ad starts playing, is clicked on, etc. You can register for the various state changed events on AdsManager.
      */
     class AdEvent {
+      /**
+       * Types of AdEvents
+       */
+      public type: AdEvent.Type;
       /**
        * Get the current ad that is playing or just played.
        * @returns The ad associated with the event, or null if there is no relevant ad.