-changed to conform with other X applications.
-
-The new behavior is that by default Emacs does not put selected text
-into the clipboard, and does not add it to kill-ring, merely because
-the text was selected. Only commands that kill text or copy it to the
-kill-ring (C-w, M-w, C-k, etc.) put the killed text into the
-clipboard. Selected text is put into the primary selection (on
-systems, such as X, that support the primary selection separately from
-the clipboard).
-
-Similarly, Emacs by default does not retrieve text from the clipboard
-when the mouse (e.g., mouse-2) is used for pasting text selected in
-another application. Mouse commands that paste text retrieve text
-from the primary selection, on systems that support it separately from
-the clipboard. Text from the clipboard is retrieved only by C-y, M-y
-and other commands that yank text from the kill-ring.
-
-In other words, the default behavior is that mouse gestures that
-select and paste text work with the primary selection (on X), while
-keyboard commands that kill/copy and paste text work with the
-clipboard.
-
-This change also means that the "Copy", "Cut", and "Paste" items of
-the menu-bar "Edit" menu are now exactly equivalent to, respectively
-M-w, C-w, and C-y.
-
-To get back the previous behavior, whereby mouse gestures set the
-clipboard and retrieve text from there, customize the variables
-`mouse-drag-copy-region' and (on X only) `x-select-enable-primary' to
-non-nil values. If you don't want Emacs to put the text into the
-clipboard, only to the primary selection, additionally customize
-`x-select-enable-clipboard' to nil.
-
-These changes in the default behavior are reflected in the default
-values of several variables:
-
-*** `select-active-regions' now defaults to t, so active regions set
-the primary selection. It was nil in previous versions.
+changed to conform with other X applications. The exact changes are
+described below; in short, mouse commands to select and paste text now
+use the primary selection, while all other commands for killing and
+yanking text now use the clipboard.
+
+*** Merely selecting text (e.g. with drag-mouse-1) does not add it to
+the kill-ring. On systems with a primary selection separate from the
+clipboard (such as X), the selected text is put in the primary
+selection.