diff --git a/p2.md b/p2.md
index 02710c39cdb65762d33f108787db907e8af547f7..e0f82f852da89979ad35bf48c6c8b4005ac61fbd 100644
--- a/p2.md
+++ b/p2.md
@@ -168,6 +168,7 @@ locking behavior identical as shown in the video.
 ## Notes
 - Use the `context` to set RPC timeouts to 60 seconds.
 - Your server main should spawn off your `http` server in a new goroutine, and be always available.
+- gRPC communication requires that the server listen to an address w/o the host, e.g. ":50050" in order to work across the network.
 
 ## Grading
 I will assign grades vaguely as follow: