diff --git a/build.gradle b/build.gradle
index 0d6ab4a474260d5ae65ff731ce4f26754153bea0..3d2b13231027e32bd74879f2616071ce8bd6c4fc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.2.3'
-        classpath 'com.google.gms:google-services:3.0.0'
+        classpath 'com.google.gms:google-services:3.0.0' // Firebase
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files