diff --git a/website/content/api-docs/secret/transit.mdx b/website/content/api-docs/secret/transit.mdx
index c47eaee229..0e4956b498 100644
--- a/website/content/api-docs/secret/transit.mdx
+++ b/website/content/api-docs/secret/transit.mdx
@@ -1695,6 +1695,8 @@ or [generate CMAC](#generate-cmac) API calls.
   `/transit/cmac` function. One of the following arguments must be supplied
   `signature`, `hmac` or `cmac`.
 
+- `mac_length` (int: 0) - Specifies the MAC length used to generate the CMAC.
+
 - `reference` `(string: "")` -
   A user-supplied string that will be present in the `reference` field on the
   corresponding `batch_results` item in the response, to assist in understanding