Jetpack Markdown

Hey everyone! Thanks in advance for your help! Appreciate you taking time out of your busy day to help a wordpress noob!

Anyway, I am using Markdown with wordpress jetpack and one thing I cannot figure out how to do is insert two spaces at the end of a sentence (after a period). Whenever I try this, the markdown editor just turns two spaces into one.

This sounds familiar to me, what am I forgetting? How can I insert two spaces?

Thanks!