What information is tracked under the Reviews tab in the Activity section of a user's profile?

I assume this section is related in some way to actions which are performed on posts listed for review. But I thought that I had reviewed some posts which were in this list, yet nothing has changed under Reviews in my profile.

I clearly do not understand the Reviews tab or the information it is meant to provide.

###I think I understand now

If you suggest an edit then this is tracked under the Suggestions tab in the Activity section. If you review a suggested edit and either approve or reject it, then this is (apparently) tracked under the Reviews tab.

Since I lack the karma to do any approving or rejecting, there is not going to be any activity under my Reviews tab.