Grunt watches correctly, changes don't show anyway

[Asitis]

Steps to reproduce

Follow these steps from the doc exactly (Magento 2.1)

• Create Theme
• Configure Grunt for theme (etc.)
• Run grunt exec:theme
• Run grunt less:theme
• Run grunt watch

Expected result

1. Make a css-change
2. Grunt watch picks up on change and works it's magic
3. Refresh page, see changes
   (Like it says in the docs)

Actual result

1. Make a css-change
2. Grunt watch picks up on change and works it's magic
3. Refresh page, no changes

Already tried

1. Resetting permissions
2. Set developer mode
3. Turn off cache

I only see the changes after I clear out the complete /var/ folder, then run exec:theme and less:theme again.

This makes the entire Grunt functionality pretty worthless, and I can't imagine that's supposed to be. A bug?

[Asitis]

Nope! Just me :)
I got it to work after consulting this article. I'm pretty sure the key was that I hadn't set 'css/styles-m' and 'css/styles-l' too in my Grunt themes.js config file.
The style I added to my theme was _extend.less which, I figured, since grunt watch did pick up on the changes would merge anyway. Guess it doesn't work that way.