Add a hook to verify python ast.
diff --git a/README.md b/README.md
index 93b6360..65e8617 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@
see `.pre-commit-config.yaml` in this repository for an example.
- `check-added-large-files` - Prevent giant files from being committed.
- Specify what is "too large" with `args: ['--maxkb=123']` (default=500kB).
+- `check-ast` - Simply check whether files parse as valid python.
- `check-case-conflict` - Check for files with names that would conflict on a
case-insensitive filesystem like MacOS HFS+ or Windows FAT.
- `check-docstring-first` - Checks for a common error of placing code before
