Change 'cache' to 'index' in the docs

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 32005b03f3bee40413d7ff0d33e143de85b194c6..8eef86e474aee14bb6743f0f81d6aa802ef8a621 100644 (file)
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -50,7 +50,7 @@
        <orderfile>, which has one shell glob pattern per line.
 
 -R::
-       Swap two inputs; that is, show differences from cache or
+       Swap two inputs; that is, show differences from index or
        on-disk file to tree contents.
 
 For more detailed explanation on these common options, see also