User defined snippet not working next to closing HTML tag.

[BillyKoala]

I created a snippet called 'comm' to enable me to define and add a comment to a closing tag. For example:
<h1>Hello World</h1>comm. Unfortunately, trying to use the Ctrl-Alt-Spacebar combination immediately after a closing tag will not execute the snippet. Any ideas??? Snippet code below:
{
"name": "Insert Comment",
"trigger": "comm",
"usage": "<!-- Comment -->",
"description": "Insert A Comment",
"template": "<!-- $${Comment}!!{cursor} -->"
}