Milner, 20, has decided to remain with the Nailers despite offers elsewhere.
The summer signing from Buxton said: “I’m pleased that this has been settled as I’m really enjoying my football at Belper.”
Meanwhile, Belper unveiled their new electronic scoreboard at The Silver X Stadium as part of their continued ground improvements.
It was in operation for the first time at Saturday’s EVO-STIK League East Division clash with Lincoln United, and is sponsored by Browns Builders Merchants Ltd of Derby.
A club spokesperson said: “The Nailers would like to thank club sponsor Jim Parlato & Jerry Wheeler directors of Browns Builders Merchants for their generosity and continued support for our club.”
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