diff --git a/lib/parser.js b/lib/parser.js
index b869141b5..4b9af379b 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -30,10 +30,10 @@ module.exports = {
 /**
  * The complete list of parse configuration options used to parse the given data.
  * @typedef {Object} ParserOptions
- * @property {String} path - Path to the AsyncAPI document. It will be used to resolve relative references. Defaults to current working dir.
- * @property {Object} parse - Options object to pass to {@link https://apidevtools.org/json-schema-ref-parser/docs/options.html|json-schema-ref-parser}.
- * @property {Object} resolve - Options object to pass to {@link https://apidevtools.org/json-schema-ref-parser/docs/options.html|json-schema-ref-parser}.
- * @property {Boolean} applyTraits - Whether to resolve and apply traits or not. Defaults to true.
+ * @property {String=} path - Path to the AsyncAPI document. It will be used to resolve relative references. Defaults to current working dir.
+ * @property {Object=} parse - Options object to pass to {@link https://apidevtools.org/json-schema-ref-parser/docs/options.html|json-schema-ref-parser}.
+ * @property {Object=} resolve - Options object to pass to {@link https://apidevtools.org/json-schema-ref-parser/docs/options.html|json-schema-ref-parser}.
+ * @property {Boolean=} applyTraits - Whether to resolve and apply traits or not. Defaults to true.
  */
 
 /**