diff --git a/Documentation/git-diff.txt b/Documentation/git-diff.txt
index fe34d4edb4..dd1fb32786 100644
--- a/Documentation/git-diff.txt
+++ b/Documentation/git-diff.txt
@@ -23,9 +23,9 @@ tree and the index file, or the index file and the working tree.
 	further add to the index but you still haven't.  You can
 	stage these changes by using linkgit:git-add[1].
 +
-If exactly two paths are given, and at least one is untracked,
-compare the two files / directories. This behavior can be
-forced by --no-index.
+If exactly two paths are given and at least one points outside
+the current repository, 'git diff' will compare the two files /
+directories. This behavior can be forced by --no-index.
 
 'git diff' [--options] --cached [<commit>] [--] [<path>...]::