diff --git a/packages/google_mobile_ads/android/src/main/java/io/flutter/plugins/googlemobileads/FlutterAdSize.java b/packages/google_mobile_ads/android/src/main/java/io/flutter/plugins/googlemobileads/FlutterAdSize.java
index 94009cff9..3f47caf3b 100644
--- a/packages/google_mobile_ads/android/src/main/java/io/flutter/plugins/googlemobileads/FlutterAdSize.java
+++ b/packages/google_mobile_ads/android/src/main/java/io/flutter/plugins/googlemobileads/FlutterAdSize.java
@@ -67,7 +67,7 @@ private static AdSize getAdSize(
 
   static class SmartBannerAdSize extends FlutterAdSize {
 
-    @SuppressWarnings("deprecation")
+    @SuppressWarnings("deprecation") // Smart banner is already deprecated in Dart.
     SmartBannerAdSize() {
       super(AdSize.SMART_BANNER);
     }