The actor revealed he would be stepping down from the series after three years in January and, fortunately, he didn't have to face the decision alone.
Awww, you guys...
"I think it was quite an emotional decision for him," Moffat told SFX Magazine. "It was quite emotional for all the Doctors. They've all found it very difficult.
"I know David and Matt got in touch with him straight away when they heard, because stepping down from that role isn't nothing.
"At the same time, from the day you get it, you know that day is coming. And if you're Scottish you probably think about it every second day! This is going to end."
During the interview, Moffat also voiced his support for Capaldi's decision to leave after three years on the show.
"There is a logic to three years," he added. "And for an actor of Peter's stature and brilliance, he's cracked it now.
"He's done it. He's done that job. And now he can go and do another one."
Doctor Who returns to BBC One on Saturday, April 15.
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