diff --git a/src/structures/ClientUser.js b/src/structures/ClientUser.js
index 92fe176f5..dd227c31c 100644
--- a/src/structures/ClientUser.js
+++ b/src/structures/ClientUser.js
@@ -22,7 +22,8 @@ class ClientUser extends Structures.get('User') {
 
     /**
      * The email of this account
-     * @type {string}
+     * <warn>This is only filled when using a user account.</warn>
+     * @type {?string}
      */
     this.email = data.email;
     this._typing = new Map();