(defcustom x-select-enable-clipboard t
"Non-nil means cutting and pasting uses the clipboard.
-This is in addition to the primary selection."
+This is in addition to, but in preference to, the primary selection.
+
+On MS-Windows, this is non-nil by default, since Windows does not
+support other types of selections. \(The primary selection that is
+set by Emacs is not accessible to other programs on Windows.\)"
:type 'boolean
:group 'killing)