diff --git a/specification/client_server_api.rst b/specification/client_server_api.rst
index 50ffff8f..eb32d3b4 100644
--- a/specification/client_server_api.rst
+++ b/specification/client_server_api.rst
@@ -745,7 +745,7 @@ A client may receive a login ``token`` via some external service, such as email
 or SMS. Note that a login token is separate from an access token, the latter
 providing general authentication to various API endpoints.
 
-Additionally, the server must encode the user id in the ``token``; there is
+Additionally, the server must encode the user ID in the ``token``; there is
 therefore no need for the client to submit a separate username.
 
 The ``txn_id`` should be a random string generated by the client for the