org-log-note-headings

org-log-note-headings is a variable defined in `org.el'.
Its value is shown below.

Documentation:
Headings for notes added to entries.
The value is an alist, with the car being a symbol indicating the note
context, and the cdr is the heading to be used. The heading may also be the
empty string.
%t in the heading will be replaced by a time stamp.
%T will be an active time stamp instead the default inactive one
%d will be replaced by a short-format time stamp.
%D will be replaced by an active short-format time stamp.
%s will be replaced by the new TODO state, in double quotes.
%S will be replaced by the old TODO state, in double quotes.
%u will be replaced by the user name.
%U will be replaced by the full user name.

In fact, it is not a good idea to change the `state' entry, because
agenda log mode depends on the format of these entries.

You can customize this variable.

Value:

((done . "CLOSING NOTE %t")
 (state . "State %-12s from %-12S %t")
 (note . "Note taken on %t")
 (reschedule . "Rescheduled from %S on %t")
 (delschedule . "Not scheduled, was %S on %t")
 (redeadline . "New deadline from %S on %t")
 (deldeadline . "Removed deadline, was %S on %t")
 (refile . "Refiled on %t")
 (clock-out . ""))