diff --git a/27_apod/script.js b/27_apod/script.js
index fff3988..876ae13 100644
--- a/27_apod/script.js
+++ b/27_apod/script.js
@@ -1,4 +1,5 @@
-API_KEY = "DEMO_KEY";
+// api klíč získáte na https://api.nasa.gov/
+API_KEY = "DEMO_KEY"; 
 API_URL = "https://api.nasa.gov/planetary/apod";
 
 //elementy