diff --git a/src/client.js b/src/client.js
index e1596bb40..cbb70a694 100644
--- a/src/client.js
+++ b/src/client.js
@@ -770,7 +770,6 @@ MatrixClient.prototype.setAccountData = function(eventType, contents, callback)
 /**
  * Get account data event of given type for the current user.
  * @param {string} eventType The event type
- * @param {module:client.callback} callback Optional.
  * @return {?object} The contents of the given account data event
  */
 MatrixClient.prototype.getAccountData = function(eventType) {