diff --git a/rollup.config.js b/rollup.config.js
index 9a7dc4b2..d87ad0ca 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -36,9 +36,9 @@ extensionLocaleDirs.forEach((dir) => {
  */
 
 /**
- * @param {PlainObject} config
- * @param {boolean} config.minifying
- * @param {string} [config.format='umd'} = {}]
+ * @param {PlainObject} [config={}]
+ * @param {boolean} [config.minifying]
+ * @param {string} [config.format='umd']
  * @returns {external:RollupConfig}
  */
 function getRollupObject ({minifying, format = 'umd'} = {}) {