If one of them returns non-nil, the file is considered already written
and the rest are not called.
These hooks are considered to pertain to the visited file.
-So this list is cleared if you change the visited file name.
+So any buffer-local binding of `write-file-hooks' is
+discarded if you change the visited file name with \\[set-visited-file-name].
Don't make this variable buffer-local; instead, use `local-write-file-hooks'.
See also `write-contents-hooks'.")