From 0f254bb343074ae69b3e14963ffe1cc4c23ceae7 Mon Sep 17 00:00:00 2001
From: Kamal Marhubi <kamal@marhubi.com>
Date: Mon, 1 Feb 2016 12:55:12 -0500
Subject: [PATCH] docs: Clarify return type of lookup_project_file

---
 src/bin/rustfmt.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bin/rustfmt.rs b/src/bin/rustfmt.rs
index 3bd575bfe87..14cb63db7d5 100644
--- a/src/bin/rustfmt.rs
+++ b/src/bin/rustfmt.rs
@@ -43,7 +43,8 @@ enum Operation {
     Stdin(String, WriteMode),
 }
 
-/// Try to find a project file in the given directory and its parents.
+/// Try to find a project file in the given directory and its parents. Returns the path of a the
+/// nearest project file if one exists, or `None` if no project file was found.
 fn lookup_project_file(dir: &Path) -> io::Result<Option<PathBuf>> {
     let mut current = if dir.is_relative() {
         try!(env::current_dir()).join(dir)