I have a tree of deeply nested keymaps, with many possible leaves (commands), too many for a human to remember. For simplicity, let's say each command is associated with a given file name.
I would like to display a help tool-tip as the user is walking down these keymaps, indicating which files/commands are bound to which keys.
So, I would like to associate with certain keymaps a short documentation, and display it whenever the user is "on" the keymap (perhaps using help-fns+.el or some other custom docstring).
What is the best way of doing this?