ESA quick question, thankyou

Hello Ladies,

Ive been receiving esa allowance for 13 weeks on the basic amount £67 a week, i filled out the dreaded form and i received a letter last week that i meet criteria for Support group and my weekly money has gone up to £99.85 a week, BUT they also have sent me another form ESA3 saying that i may be entitled to some extra money!!!

now my question is

What do they mean, after filling this form in could they reasses what they have agreed to give me?

thankyou for all your help

take care