diff --git a/lib/types/keyserver-types.js b/lib/types/keyserver-types.js
index 7b30d09f9..ab4735281 100644
--- a/lib/types/keyserver-types.js
+++ b/lib/types/keyserver-types.js
@@ -1,28 +1,28 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { tShape } from '../utils/validation-utils.js';
 
 // Once we start using the cookie field on web,
-// the cookie field type should be changed to string | null.
+// the cookie field should be mandatory, of type ?string.
 // See https://linear.app/comm/issue/ENG-4347/stop-using-browser-cookies
 export type KeyserverInfo = {
   +cookie?: ?string,
   +sessionID?: ?string,
 };
 
 export type KeyserverStore = {
   +keyserverInfos: { +[key: string]: KeyserverInfo },
 };
 
 export const keyserverInfoValidator: TInterface<KeyserverInfo> =
   tShape<KeyserverInfo>({
     cookie: t.maybe(t.String),
     sessionID: t.maybe(t.String),
   });
 
 export const keyserverStoreValidator: TInterface<KeyserverStore> =
   tShape<KeyserverStore>({
     keyserverInfos: t.dict(t.String, keyserverInfoValidator),
   });