Using comments in the config
You can put comments into the config.
You can only use the /* ... */ syntax, like CSS.
For example:

/* This is my amazing config. */
#myDiv:mouseover {
console-log: "You just moused over myDiv."; /* you can put comments mostly where you want */
}
Do not use // for comments in your config. Things will probably break if you do. That comment type is not supported in CSS or Active CSS.