+.SH USING GDM(1)
+The instructions for using \fIxscreensaver\fP with
+.BR gdm (1)
+are almost the same as for using
+.BR xdm (1),
+above. There are only two differences, really: instead
+of editing \fI/usr/lib/X11/xdm/Xsetup\fP, edit the
+file \fI/etc/X11/gdm/Init/Default\fP; and instead of
+editing \fI/usr/lib/X11/xdm/Xsession\fP, edit one or all of the
+files in the \fI/etc/X11/gdm/Sessions/\fP directory. (Note that
+the default session (\fI/etc/X11/gdm/Sessions/Default\fP) usually
+simply executes \fI/usr/lib/X11/xdm/Xsession\fP, so be careful
+you aren't initializing xscreensaver twice.)
+
+All the same caveats apply for
+.BR gdm (1)
+as for
+.BR xdm (1).