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-rw-r--r--lisp/rect.el4
1 files changed, 4 insertions, 0 deletions
diff --git a/lisp/rect.el b/lisp/rect.el
index 12e62b6a990..a62ed95b715 100644
--- a/lisp/rect.el
+++ b/lisp/rect.el
@@ -450,6 +450,10 @@ With a prefix (or a FILL) argument, also fill too short lines."
"Replace rectangle contents with STRING on each line.
The length of STRING need not be the same as the rectangle width.
+When called interactively and option `rectangle-preview' is
+non-nil, display the result as the user enters the string into
+the minibuffer.
+
Called from a program, takes three args; START, END and STRING."
(interactive
(progn