diff --git a/data/api/client-server/openid.yaml b/data/api/client-server/openid.yaml
index a6adeb7f..28c28516 100644
--- a/data/api/client-server/openid.yaml
+++ b/data/api/client-server/openid.yaml
@@ -47,7 +47,7 @@ paths:
           type: string
           name: userId
           description: |-
-            The user to request and OpenID token for. Should be the user who
+            The user to request an OpenID token for. Should be the user who
             is authenticated for the request.
           required: true
           x-example: "@alice:example.com"