diff --git a/src/github.com/matrix-org/dendrite/roomserver/api/input.go b/src/github.com/matrix-org/dendrite/roomserver/api/input.go
index 0a921962a..d8b1bfb59 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/api/input.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/api/input.go
@@ -30,7 +30,7 @@ type InputRoomEvent struct {
 	Kind int
 	// The event JSON for the event to add.
 	Event []byte
-	// Optional list of state events forming the state before this event.
+	// Optional list of state event IDs forming the state before this event.
 	// These state events must have already been persisted.
 	State []string
 }