diff --git a/README.md b/README.md
index 603e08c..51c4444 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,12 @@
 - `check-xml` - Attempts to load all xml files to verify syntax.
 - `check-yaml` - Attempts to load all yaml files to verify syntax.
 - `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.
+- `detect-aws-credentials` - Checks for the existence of AWS secrets that you
+  have set up with the AWS CLI.
+  The following arguments are available:
+  - `--credential-file` - additional AWS CLI style configuration file in a
+    non-standard location to fetch configured credentials from. Can be repeated
+    multiple times.
 - `detect-private-key` - Checks for the existence of private keys.
 - `double-quote-string-fixer` - This hook replaces double quoted strings
   with single quoted strings.