diff --git a/lib/Transaction.js b/lib/Transaction.js
index 4bab35f..c6062f6 100644
--- a/lib/Transaction.js
+++ b/lib/Transaction.js
@@ -166,7 +166,7 @@ Transaction.prototype.remove = function (path, version) {
  * Execute the transaction atomically.
  *
  * @method commit
- * @param callback {[Function]} callback function.
+ * @param [callback] {Function} callback function.
  * @returns {Promise} return promise if callback is not provided
  */
 Transaction.prototype.commit = function (callback) {