"Lennart Borgman (gmail)" <address@hidden> writes:
And in elisp Info:
That is, (info "(elisp)Special Properties")
`modification-hooks'
If a character has the property `modification-hooks', then its
value should be a list of functions; modifying that character
calls all of those functions. Each function receives two
arguments: the beginning and end of the part of the buffer being
modified. Note that if a particular modification hook function
Wrong section. Try (info "(elisp)Overlay Properties")
`modification-hooks'
This property's value is a list of functions to be called if
any character within the overlay is changed or if text is
inserted strictly within the overlay.