Recently I started tracking the time I spent on various coding activities using Org mode. C-c C-x C-i is used to start the timer and C-c C-x C-o is used to stop the timer. I like to add some details about where the time was spent when the timer is stopped. Org mode allows to enter such notes using org-log-note-clock-out variable.

The description of this variable says -

Non-nil means record a note when clocking out of an item.

So I set the variable to true in my Org settings.

(setq org-log-note-clock-out t)

Now whenever I stop the timer, it opens a new buffer from where I can add a note describing what was done in that particular time.

My complete Org mode settings can be found here

Happy Hacking!