diff --git a/api/client-server/list_public_rooms.yaml b/api/client-server/list_public_rooms.yaml
index 253cfe07..a34f50b3 100644
--- a/api/client-server/list_public_rooms.yaml
+++ b/api/client-server/list_public_rooms.yaml
@@ -54,6 +54,10 @@ paths:
                         Aliases of the room. May be empty.
                       items:
                         type: string
+                    canonical_alias:
+                      type: string
+                      description: |-
+                        The canonical alias of the room, if any. May be null.
                     name:
                       type: string
                       description: |-