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-rw-r--r--lisp/mouse.el4
1 files changed, 3 insertions, 1 deletions
diff --git a/lisp/mouse.el b/lisp/mouse.el
index 4de3e175a4a..63395619f44 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -687,7 +687,9 @@ This should be bound to a mouse click event type."
(defun mouse-set-region (click)
"Set the region to the text dragged over, and copy to kill ring.
-This should be bound to a mouse drag event."
+This should be bound to a mouse drag event.
+See the `mouse-drag-copy-region' variable to control whether this
+command alters the kill ring or not."
(interactive "e")
(mouse-minibuffer-check click)
(select-window (posn-window (event-start click)))