diff --git a/Service-Function-Usage.md b/Service-Function-Usage.md
index 10754b8..8606305 100644
--- a/Service-Function-Usage.md
+++ b/Service-Function-Usage.md
@@ -20,3 +20,11 @@ As a means to help with testing and verifying, this page serves to list a handfu
 
 - Super Mario Odyssey
 
+## friend
+
+### IFriendService
+
+#### UpdateUserPresence
+
+- Retro City Rampage (needed to go in-game)
+