diff --git a/lib/client.js b/lib/client.js
index 239395584..8b0867771 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -2797,6 +2797,13 @@ MatrixClient.prototype.register = function(username, password,
  * therefore bypassing the registration-specific logic.
  *
  * Parameters and return value are as for requestEmailToken
+
+ * @param {string} email As requestEmailToken
+ * @param {string} clientSecret As requestEmailToken
+ * @param {number} sendAttempt As requestEmailToken
+ * @param {string} nextLink As requestEmailToken
+ * @param {module:client.callback} callback Optional. As requestEmailToken
+ * @return {module:client.Promise} Resolves: As requestEmailToken
  */
 MatrixClient.prototype.requestRegisterEmailToken = function(email, clientSecret,
                                                     sendAttempt, nextLink, callback) {