Rage mod tools are coming soon, id Software's John Carmack has said.
They were supposed to ship alongside the post-apocalyptic first-person shooter in October 2011 - a year ago - but failed to materialise.
According to Carmack, id's work on Doom 3: BFG Edition shoved Rage mod tools to the side, but now all that's done with, they will be released.
In a tweet the id co-founder expressed his frustration at the delay, and admitting to making mistakes on the issue.
"BFG work pushed the Rage tools, but Real Soon Now. I hope. Sigh. I think we have made poor decisions on this all year," Carmack said.