Mackie penned a new deal to 2015 today.
"Hopefully the manager can add even more quality to the squad in the summer to supplement what we've already got," said the former Plymouth striker, who moved to QPR in May 2010.
"With the new training ground too and the passion of the owners for the club, it's an amazing time for the Football Club.
"From day one, the fans have brilliant with me - especially when I broke my leg. They carried on supporting me all the way through that.
"It meant a lot to me. Hopefully my performances since have gone a little way to paying them back for the support that they showed me."