Using Shift in xkb bindings

[tmtvl]

So I've been wrestling with xkb bindings for a bit over the use of Shift. For example, I've gotten used to Awesome's default keybinding of Mod4+Shift+C to close a window (I'm a stickler for having Mod4 be a part of every possible system-wide shortcut, leaving all other possible combinations for use in applications). Turns out that when using Shift in a binding with a letter you need to use the upper case letter as well. So while I launch Rofi with Mod4+d (and the d must be lower case), the window closing shortcut must be Mod4+Shift+C with an upper case C.

It took me embarrassingly long to figure that out so I figured I'd make this post in case anyone else gets stuck on this.