Spell Descriptions on Homebrew Monster sheet

Hi All,

First time DM here. I created a BBEG for my homebrew campaign, but cannot figure out how to get the spell descriptions to appear like they do on some of the other monster sheets when you hover over the spell. 

For reference as to what I'm talking about, take a look at Strahd Von Zorovich's character sheet https://www.dndbeyond.com/monsters/strahd-von-zarovich 

Any help you can offer is appreciated!

Put "spell" tags around a spell name like so to get a tooltip:

• mage armor
• [ spell]mage armor[ /spell] (but without the spaces after the [s )
• mage armor

Thank you!