diff --git a/samples/admob/mediation_example/lib/app_bar_item.dart b/samples/admob/mediation_example/lib/app_bar_item.dart
index b015104ab..0c986a74d 100644
--- a/samples/admob/mediation_example/lib/app_bar_item.dart
+++ b/samples/admob/mediation_example/lib/app_bar_item.dart
@@ -1,9 +1,13 @@
 /// Example app bar class.
 class AppBarItem {
+  /// Helper variable for the ad inspector button text.
   static const adInpsectorText = 'Ad Inspector';
 
+  /// Button text.
   final String label;
+  /// Button value.
   final int value;
 
+  /// Initialize the class.
   AppBarItem(this.label, this.value);
 }