Synonym for --cached.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 Documentation/git-grep.txt | 5 ++++-
 builtin/grep.c             | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index 8497aa4..9f7899c 100644
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -25,7 +25,7 @@ SYNOPSIS
           [-W | --function-context]
           [-f <file>] [-e] <pattern>
           [--and|--or|--not|(|)|-e <pattern>...]
-          [ [--[no-]exclude-standard] [--cached | --no-index | --untracked] | 
<tree>...]
+          [ [--[no-]exclude-standard] [--cached | --staged | --no-index | 
--untracked] | <tree>...]
           [--] [<pathspec>...]
 
 DESCRIPTION
@@ -60,6 +60,9 @@ OPTIONS
        Instead of searching tracked files in the working tree, search
        blobs registered in the index file.
 
+--staged::
+       Synonym for `--cached`.
+
 --no-index::
        Search files in the current directory that is not managed by Git.
 
diff --git a/builtin/grep.c b/builtin/grep.c
index d3b3b1d..b953911 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -640,6 +640,8 @@ int cmd_grep(int argc, const char **argv, const char 
*prefix)
        struct option options[] = {
                OPT_BOOLEAN(0, "cached", &cached,
                        N_("search in index instead of in the work tree")),
+               OPT_BOOLEAN(0, "staged", &cached,
+                       N_("search in index instead of in the work tree")),
                OPT_NEGBIT(0, "no-index", &use_index,
                         N_("find in contents not managed by git"), 1),
                OPT_BOOLEAN(0, "untracked", &untracked,
-- 
1.8.4-fc

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