diff --git a/js/JokeService.js b/js/JokeService.js
index 4cf136e..7b0c197 100644
--- a/js/JokeService.js
+++ b/js/JokeService.js
@@ -1,20 +1,20 @@
 class JokeService {
 
-    constructor(category = ['programming', 'coding', 'development'], lang = 'en') {
-        this.category = Array.isArray(category) ? category : [category];
+    constructor(categories = ['programming', 'coding', 'development'], lang = 'en') {
+        this.categories = Array.isArray(categories) ? categories : [categories];
         this.lang = lang;
         this.apiBaseUrl = 'https://v2.jokeapi.dev/joke/'
     }
 
     setCategory(category) {
-        this.category = Array.isArray(category) ? category : [category];
+        this.categories = Array.isArray(category) ? category : [category];
     }
 
     tell() {
         let service = this;
 
         axios.get(
-            service.apiBaseUrl + getRandomItem(service.category) + '?lang=' + service.lang
+            service.apiBaseUrl + service.categories.join(',') + '?lang=' + service.lang
         ).then((response) => {
             if (response.data.error === false) {
                 service.show(response.data);
@@ -43,10 +43,6 @@ function showNotification(text) {
             body: text
         });
     } else {
-        // alert(text);
+        console.warn('Notifications sind nicht erlaubt.')
     }
 }
-
-function getRandomItem(items) {
-    return items[Math.floor(Math.random()*items.length)];
-}
\ No newline at end of file