Guideline on when to call

source/handbook/communication/index.html.md

@@ -79,7 +79,9 @@ This also helps prevent spam from people outside GitLab requesting accessing to
 **Video Chats**
-1. Use video calls if you find yourself going back and forth in an issue/via email or over chat.
+1. Use video calls if you find yourself going back and forth in an issue/via email
+or over chat. Rule of thumb: if you have gone back and forth 3 times, it's time
+for a video call.
 1. Having pets, children, significant others, friends, and family visible during
 video chats is encouraged. If they are human, ask them to wave at your remote
 team member to say "Hi".