diff --git a/Examples/simple-fcm-client/README.md b/Examples/simple-fcm-client/README.md
index 787e5d766c0aa6d4beaed5110d4a59dce3fd6d52..011fa136ffdecf8511c6e6a71b905d6b1bee458d 100644
--- a/Examples/simple-fcm-client/README.md
+++ b/Examples/simple-fcm-client/README.md
@@ -8,6 +8,7 @@
 - Overwrite `ios/GoogleService-info.plist` with your file
 - Change the _Bundle Identifier_ in Xcode project settings
 - Select your _Team_ for both targets (`SimpleFcmClient` and `SimpleFcmClientTests`)
+- Update your API_KEY [here](https://github.com/evollu/react-native-fcm/blob/master/Examples/simple-fcm-client/app/FirebaseConstants.js#L3)
 
 ## Android