Add an `--unsafe` option to `check-yaml`
diff --git a/README.md b/README.md
index 8d21a68..41e9103 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,11 @@
- `check-yaml` - Attempts to load all yaml files to verify syntax.
- `--allow-multiple-documents` - allow yaml files which use the
[multi-document syntax](http://www.yaml.org/spec/1.2/spec.html#YAML)
+ - `--unsafe` - Instaed of loading the files, simply parse them for syntax.
+ A syntax-only check enables extensions and unsafe constructs which would
+ otherwise be forbidden. Using this option removes all guarantees of
+ portability to other yaml implementations.
+ Implies `--allow-multiple-documents`.
- `debug-statements` - Check for pdb / ipdb / pudb statements in code.
- `detect-aws-credentials` - Checks for the existence of AWS secrets that you
have set up with the AWS CLI.
