Adds lazy option to git hook.

Fixes #1214

1 files changed, 6 insertions, 1 deletions

diff --git a/README.md b/README.md
index 4b7e5582..0ce08a04 100644
--- a/README.md
+++ b/README.md
@@ -526,13 +526,18 @@ include the following in `.git/hooks/pre-commit`:
 import sys
 from isort.hooks import git_hook
 
-sys.exit(git_hook(strict=True, modify=True))
+sys.exit(git_hook(strict=True, modify=True, lazy=True))
 ```
 
 If you just want to display warnings, but allow the commit to happen
 anyway, call `git_hook` without the strict parameter. If you want to
 display warnings, but not also fix the code, call `git_hook` without the
 modify parameter.
+The `lazy` argument is to support users who are "lazy" to add files
+individually to the index and tend to use `git commit -a` instead.
+Set it to `True` to ensure all tracked files are properly isorted,
+leave it out or set it to `False` to check only files added to your
+index.
 
 Setuptools integration
 ----------------------