Bristol City manager Gary Johnson called for goal line technology after his side were denied at Ashton Gate
He told Bristol City World: "How many times have people got to ask for [goal-line technology]? If you ask [Swans boss] Roberto Martinez now he would say the same.
"Some old man somewhere hasn't woken up yet to making these kind of decisions, but they have got to do it.
"It has cost us today and has cost other teams on occasions. You don't want it for offsides or throw-ins, but for something as important as a goal, it's vital.
"From our position on the touchline we weren't sure whether it had crossed the line, but from what I have seen since it looks a definite goal."
He added: "There's been a couple of decisions that have cost us this year. Maybe if those had gone for us we would have been four or five points ahead of where we are now.
"The lads put in a good stint. You have to shut a side like Swansea down. Other than the goal that wasn't a goal, we had a few opportunities and their defenders and goalkeeper certainly had the busier afternoon.
"There are two parts of a football match - there is the part where you try and get on the ball and disrupt the opposition; and the part where the opposition have the ball. Generally, the boys did both and we were one goal away from it being a decent performance.
"What I would say to our supporters is don't be disappointed with our spirit and energy to try and win the game. Sometimes it is natural to feel more disappointed if you draw at home and you are 14th, whereas if you draw when you are second it could be seen as a better result."