deleted and recreated; @code{nil} otherwise.
@item
-The file's inode number.
+The file's inode number. If possible, this is an integer. If the inode
+number is too large to be represented as an integer in Emacs Lisp, then
+the value has the form @code{(@var{high} . @var{low})}, where @var{low}
+holds the low 16 bits.
@item
The file system number of the file system that the file is in. This
@defun file-relative-name filename directory
This function does the inverse of expansion---it tries to return a
relative name that is equivalent to @var{filename} when interpreted
-relative to @var{directory}. (If such a relative name would be longer
-than the absolute name, it returns the absolute name instead.)
+relative to @var{directory}.
+
+On some operating systems, an absolute file name begins with a device
+name. On such systems, @var{filename} has no relative equivalent based
+on @var{directory} if they start with two different device names. In
+this case, @code{file-relative-name} returns @var{filename} in absolute
+form.
@example
(file-relative-name "/foo/bar" "/foo/")