1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index 7b4f73c2d1f..85b16931ec8 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -748,7 +748,9 @@ space does not end a sentence, so don't break a line there."
     (fill-paragraph arg)))
 
 (defun fill-paragraph (arg)
-  "Fill paragraph at or after point.  Prefix ARG means justify as well.
+  "Fill paragraph at or after point.
+
+If ARG is non-nil (interactively, with prefix argument), justify as well.
 If `sentence-end-double-space' is non-nil, then period followed by one
 space does not end a sentence, so don't break a line there.
 the variable `fill-column' controls the width for filling.