Wrestlers at the WWE Performance Center recently learned a thing or two from The Book of Truth … because The Sheet has learned ex-ROH manager Truth Martini coached them for a week.

Multiple sources tell us Martini’s stint was a few weeks ago, but it somehow slipped under the radar.

Recent guest coaches include Scotty 2 Hotty and Steve Corino … who were both eventually hired by WWE to work with talent at the Performance Center.

The company also hired Nigel McGuiness, who had been working for Ring of Honor — where Truth Martini called home for six years.

No word on whether this will lead to any further relationship between the two sides.