push-keys.md

@@ -6,6 +6,8 @@ We have mounted the credentials outside of docker `/opt/pushgateway/RocketChatMo
 
 to do 
 
+`/opt/pushgateway/RocketChatMobilePushGateway/credentials/google/serverKey.txt`
+
 ## Apple APN
 
 Get an Apple developer account ($ 99.- per year) and get a new push key at https://developer.apple.com/account/resources/authkeys/list