Some of the coolest features in Facebook Messenger exist buried under the surface. You have to really look for them. For instance, did you know that it comes with baked-in support for mathematical formulas written in LaTex? Check it out:

Messenger also supports longer equations. Because of the size constraints (Messenger typically occupies a small box at the bottom of your browser), when you write a longer equation, it is displayed with a scrolling bar.

Oh, another thing: Facebook only lets you write equations on the web. That’s fair enough, because I can’t imagine ever wanting to write Latex from a virtual keyboard.

The feature isn’t new. From what I can tell, people first stumbled upon it last month. But given that back-to-school season is in full swing, and LaTex is heavily used in STEM courses, I figured this could probably help someone, particularly when it comes to homework crunch time.

Read next: All eyes east: The rise of Central and Eastern Europe’s tech scene