Add --additional-github-domain to check-vcs-permalinks
diff --git a/README.md b/README.md
index 24d716f..2a76268 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,10 @@
#### `check-vcs-permalinks`
Ensures that links to vcs websites are permalinks.
+ - `--additional-github-domain DOMAIN` - Add check for specified domain.
+ Can be repeated multiple times. for example, if your company uses
+ GitHub Enterprise you may use something like
+ `--additional-github-domain github.example.com`
#### `check-xml`
Attempts to load all xml files to verify syntax.