One of the most popular free-agent buzz terms being tossed around these days is "prove-it contract," as in a player signing a one-year deal in hopes of proving his worth for a bigger, more lucrative contract a year from now.

The St. Louis Rams have almost exclusively shopped for players who fall into this category, at least when it comes to free-agent additions from other teams. Defensive lineman Alex Carrington agreed to a deal with the Rams earlier this week and, based on the contract information courtesy of ESPN Stats & Info, his deal is the very definition of "prove it."

Here's how Carrington's contract looks for those of you keeping score:

2014

Base salary: $1,000,000

Roster bonus: $500,000 (Paid at signing)

Cap value: $1.5 million

Cash value: $1.5 million

Guaranteed money: $1 million -- the $500,000 roster bonus and $500,000 of the base salary are fully guaranteed.