ediff-long-help-message-function

ediff-long-help-message-function is a variable defined in `ediff-help.el'.
Its value is

nil

• Automatically becomes permanently buffer-local when set.
• This variable may be risky if used as a file-local variable.

Documentation:
The long help message that the user can customize.
See `ediff-brief-help-message-function' for more.