diff --git a/README.md b/README.md
index ce683dd..315b14d 100644
--- a/README.md
+++ b/README.md
@@ -176,7 +176,9 @@ You can use autoload functions to define your own commands.
 " Command for git grep
 " - fzf#vim#grep(command, with_column, [options], [fullscreen])
 command! -bang -nargs=* GGrep
-  \ call fzf#vim#grep('git grep --line-number '.shellescape(<q-args>), 0, <bang>0)
+  \ call fzf#vim#grep(
+  \   'git grep --line-number '.shellescape(<q-args>), 0,
+  \   { 'dir': systemlist('git rev-parse --show-toplevel')[0] }, <bang>0)
 
 " Override Colors command. You can safely do this in your .vimrc as fzf.vim
 " will not override existing commands.