Watch Your Entries

Take a look at this hand from a tournament I just played in the Chicago area.
AT98
Kxx
Kxxxx
x

KQJ53
QTx
void
9xxxx
I was South and the bidding went 1D-p-1H to me. I bid 1S, opener passed and my partner bid 4S, doubled by RHO. LHO led a small heart to the jack and Queen. LHO won, played a heart to RHO's ace, ruffed the heart return and exited a trump, RHO following. Plan the play from here.