From https://docs.google.com/document/d/1FkJqybVsYpVg4TT8u8VPNLDFmq8td-tkL3w_OVDLD2Y/edit?ts=57e514b1:

A "change management procedures" document will describe things like timing of changes, communication, arranging for others to be available during changes.

It doesn't have to be some heavy, oppressive Change Management system, but it would be useful to agree on a set of standard actions when performing various types of changes.

E.g.
low risk change -> "just do it"
high risk change -> "1) Send email to blah, 2) Don't do it at end of the day, 3) Test change on blah using blah, 4) Make sure blah is available in case something goes wrong""