After clocking out, I would like Emacs to prompt me for a note, as when I switch the state of an entry to a state that requires an annotation.
Use case: During the day I work in several things related to one main task, which I set an entry for it in my org-mode document and clock on, and I cannot specify what is going to be work on beforehand, otherwise I would create a sub-entry and log the time there.
I will answer myself stating that the variable org-log-note-clock-out exists for this very purpose. Set it to t to add a note after clocking out.
org-log-note-clock-out variable controls whether the user is prompted to enter a note after clocking out. When set to t, a popup buffer will be created whenever org-clock-out (C-c C-x C-o) is called. You enter a note, then press C-c C-c to close the popup buffer. The note is added immediately after the CLOCK: line. The org-log-note-clock-out variable can be set globally using Emacs Lisp with (setq org-log-note-clock-out t) or per-buffer with #+STARTUP: lognoteclock-out. NB: Check the documentation for definitive information (except Drew who already knows this!) :)