diff --git a/content/server-server-api.md b/content/server-server-api.md
index 938cf825..60bc57e6 100644
--- a/content/server-server-api.md
+++ b/content/server-server-api.md
@@ -357,7 +357,7 @@ server must ensure that the event:
 
 1.  Is a valid event, otherwise it is dropped. For an event to be valid, it
     must contain a `room_id`, and it must comply with the event format of
-    that room version.
+    that [room version](/rooms).
 2.  Passes signature checks, otherwise it is dropped.
 3.  Passes hash checks, otherwise it is redacted before being processed
     further.