If the buffer is read-only, Emacs will beep and refrain from deleting
the line, but put the line in the kill ring anyway. This means that
-you can use this command to copy text from a read-only buffer."
+you can use this command to copy text from a read-only buffer.
+\(If the variable `kill-read-only-ok' is non-nil, then this won't
+even beep.)"
(interactive "P")
(kill-region (point)
;; It is better to move point to the other end of the kill