The monthly hormone shift many women experience known as PMS can temporarily transform an ordinarily rad chick into a fragile, venomous monster capable of shredding your relationship with a single estrogen-induced argument.

Like most guys, I didn’t understand the full wrath capable during a bad bout of PMS until I’d met the sh*t end of that stick one too many times.

You all know the deal; everything will be cool, you’ll get up to find the remote, and she’ll have an F’ing conniption fit, call you an asshole and start crying. But for some reason, no matter how many months we go through it, guys never see this obviously PMS-caused freak-out coming, and just declare her mentally imbalanced, all together.

Those days, brothers, are over. Recently launched PMSBuddy.com offers you free PMS warnings, via email or Facebook, for up to five women(!)–from your girlfriend to your mother to your boss.

Just enter in name, relationship, her cycle-length (number of days from start of one period to the next), and start-date of her last cycle, and PMSBuddy will notify you before she starts throwing sh*t.

The only problem I see is trying to remember to get all the information required for sign-up. But maybe after she smashes your Xbox because you forgot to take out the trash, you’ll take the time to jot-down a couple of dates.