diff --git a/lisp/window.el b/lisp/window.el
index b7736d85cd1..c4572106f45 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -1008,8 +1008,9 @@ do not permit making a new window, a suitable existing window may
 be reused and have its `window-slot' parameter value accordingly
 modified.
 
-Unless `display-buffer-mark-dedicated' is non-nil, softly
-dedicate the side window used to BUFFER.  Return the window used
+Unless `display-buffer-mark-dedicated' is non-nil, dedicate the
+side window used to BUFFER so that it does not get reused by
+other `display-buffer' action functions.  Return the window used
 for displaying BUFFER, nil if no suitable window can be found.
 
 This function installs the `window-side' and `window-slot'