diff --git a/Client-server-split.md b/Client-server-split.md
index 0c6c287..1a08c65 100644
--- a/Client-server-split.md
+++ b/Client-server-split.md
@@ -73,6 +73,12 @@ probably self-destruct when all clients are gone.
 
 [Discussion of solutions](https://github.com/sbt/sbt/wiki/Client-server-discovery-lifecycle)
 
+### Problem: client-server communication machinery
+
+What is the general shape of client-server communication? REST or WebSocket or custom protocol? Is there any "handshake" information? What sorts of messages can be sent?
+
+[Discussion of solutions](https://github.com/sbt/sbt/wiki/Client-server-communication)
+
 ### Problem: long-running tasks block the build server
 
 Some tasks are "infinite" (such as `run`), hanging around until
@@ -396,4 +402,4 @@ that requests were sent.
 
 ## Other ideas
 
-Many more will no doubt emerge over time, please share yours.
+Many more will no doubt emerge over time, please share yours.
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