Smith's current deal was set to expire in the summer but he is now contracted to remain with the Robins until the end of the 2011/2012 campaign.
The goalkeeper told Swindon's official website: "I had to think about it for a while because obviously I haven't played a lot, but I won't have a better chance of playing in the Championship than I will here.
"The club has progressed massively in the last couple of years and I want to be a part of it.
"Swindon have shown their faith in me and they've made me feel wanted which was the big thing and made it easy for me in the end."
Source: Team_Talk
