Fulham boss Hughes delighted Johnson on scoresheet
AJ came off the bench to net a late equaliser.
"I won't take any credit for that - I'm just trying to make a difference," Hughes said.
"Obviously AJ (Johnson) was ready to go on and make an impact, and Bobby and Gael (Kakuta) were the same.
"That's what you want when you make changes and Bobby used his physical presence in a key area of the field, then AJ - who had been on for about 18 seconds - did exactly what I hoped he would do.
"It's great for him because he has just lacked goals of late and that is the only thing that has been missing from his performances. That goal will do him the power of good."