diff --git a/lib/parser.js b/lib/parser.js
index 6a158f052..b869141b5 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -40,7 +40,7 @@ module.exports = {
  * Parses and validate an AsyncAPI document from YAML or JSON.
  * 
  * @param {(String | Object)} asyncapiYAMLorJSON An AsyncAPI document in JSON or YAML format.
- * @param {ParserOptions} options Configuration options object {@link ParserOptions}
+ * @param {ParserOptions=} options Configuration options object {@link ParserOptions}
  * @returns {Promise<AsyncAPIDocument>} The parsed AsyncAPI document.
  */
 async function parse(asyncapiYAMLorJSON, options = {}) {
@@ -122,8 +122,8 @@ async function parse(asyncapiYAMLorJSON, options = {}) {
  * Fetches an AsyncAPI document from the given URL and passes its content to the `parse` method.
  * 
  * @param {String} url URL where the AsyncAPI document is located.
- * @param {Object} [fetchOptions] Configuration to pass to the {@link https://developer.mozilla.org/en-US/docs/Web/API/Request|fetch} call.
- * @param {ParserOptions} [options] Configuration to pass to the {@link ParserOptions} method.
+ * @param {Object=} [fetchOptions] Configuration to pass to the {@link https://developer.mozilla.org/en-US/docs/Web/API/Request|fetch} call.
+ * @param {ParserOptions=} [options] Configuration to pass to the {@link ParserOptions} method.
  * @returns {Promise<AsyncAPIDocument>} The parsed AsyncAPI document.
  */
 function parseFromUrl(url, fetchOptions, options) {