diff --git a/core/frontend/services/url/Resource.js b/core/frontend/services/url/Resource.js
index a996f9a6e0..d2d2c7cfc1 100644
--- a/core/frontend/services/url/Resource.js
+++ b/core/frontend/services/url/Resource.js
@@ -6,6 +6,10 @@ const errors = require('@tryghost/errors');
  * Resource cache.
  */
 class Resource extends EventEmitter {
+    /**
+     * @param {('posts'|'pages'|'tags'|'authors')} type - of the resource
+     * @param {Object} obj - object data to sotre
+     */
     constructor(type, obj) {
         super();
 
diff --git a/core/frontend/services/url/UrlGenerator.js b/core/frontend/services/url/UrlGenerator.js
index 915efbf5e2..e783212ae4 100644
--- a/core/frontend/services/url/UrlGenerator.js
+++ b/core/frontend/services/url/UrlGenerator.js
@@ -142,7 +142,7 @@ class UrlGenerator {
 
     /**
      * @description Try to own a resource and generate it's url if so.
-     * @param {Resource} resource
+     * @param {import('./Resource')} resource - instance of the Resource class
      * @returns {boolean}
      * @private
      */