From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Sun, 6 Dec 2009 00:58:40 +0000 (+0000)
Subject: (completion-in-region): Improve docstring.
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(completion-in-region): Improve docstring.
---

diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 66895b0fdb0..b850cef1ed9 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -1078,6 +1078,7 @@ and PREDICATE, either by calling NEXT-FUN or by doing it themselves.")
 
 (defun completion-in-region (start end collection &optional predicate)
   "Complete the text between START and END using COLLECTION.
+Return nil if there is no valid completion, else t.
 Point needs to be somewhere between START and END."
   ;; FIXME: some callers need to setup completion-ignore-case,
   ;; completion-ignored-extensions.  The latter can be embedded in the