diff --git a/app/src/main/java/com/google/android/gms/ads/identifier/AdvertisingIdClient.java b/app/src/main/java/com/google/android/gms/ads/identifier/AdvertisingIdClient.java
index c4a1588dd..3924681c4 100644
--- a/app/src/main/java/com/google/android/gms/ads/identifier/AdvertisingIdClient.java
+++ b/app/src/main/java/com/google/android/gms/ads/identifier/AdvertisingIdClient.java
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 package com.google.android.gms.ads.identifier;
 
 import android.content.Context;