Its telling me to replace the h1 to Catphotoapp but when I do it says its wrong

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**
<html> 
<catphotoapp>Hello World</catphotoapp> 
</body>
</html>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Safari/605.1.15

Challenge: Step 1

Link to the challenge:

The <h1 > tag is used to define your header. You don’t change it but you have to change the text that is between the tags.