diff --git a/doc/api.org b/doc/api.org
index 2d0046c..daa6e5b 100644
--- a/doc/api.org
+++ b/doc/api.org
@@ -31,6 +31,7 @@
        #+BEGIN_SRC json
          {
              "type": "update",
+             "game-id": 1,
              "direction": "left",
          }
        #+END_SRC
@@ -49,6 +50,7 @@
        #+BEGIN_SRC json
          {
              "type": "update",
+             "game-id": 1,
              "direction": null
          }
        #+END_SRC