diff --git a/doc/emacs/frames.texi b/doc/emacs/frames.texi
index c94d690cf7..110199304e 100644
--- a/doc/emacs/frames.texi
+++ b/doc/emacs/frames.texi
@@ -1106,6 +1106,14 @@ then pressing that modifier key when dropping the text will copy it
 instead of cutting it, even if you drop on the same buffer as the one
 from which the text came.
 
+If you want to cut text even when source and destination buffers
+differ, set variable
+@code{mouse-drag-and-drop-region-cut-when-buffers-differ} to non-nil.
+If you do not want to see selected text in a tooltip in a graphic
+display and/or move point together with the mouse cursor during
+dragging, set @code{mouse-drag-and-drop-region-show-tooltip} and/or
+@code{mouse-drag-and-drop-region-show-cursor} to nil.
+
 @vindex dnd-open-file-other-window
   Dropping a file normally visits it in the window you drop it on.  If
 you prefer to visit the file in a new window in such cases, customize