How to place non-html comments in an aspx file

I ran across a small issue. It's easier for me to put in comments in the html to see what's happening in my aspx file. But, i didn't want to clutter up the html that was sent to the browser for performance issues and cleanliness. Here's how I did it.

< % - - whatever the comment is - - % > Remember there are no spaces between the < and the -