diff --git a/website/source/docs/state/remote/s3.html.md b/website/source/docs/state/remote/s3.html.md
index 4f0f51b18..ebeefd616 100644
--- a/website/source/docs/state/remote/s3.html.md
+++ b/website/source/docs/state/remote/s3.html.md
@@ -51,3 +51,4 @@ The following configuration options / environment variables are supported:
     to be applied to the state file.
  * `access_key` / `AWS_ACCESS_KEY_ID` - (Optional) AWS access key
  * `secret_key` / `AWS_SECRET_ACCESS_KEY` - (Optional) AWS secret key
+ * `kms_key_id` - (Optional) Set to to the ARN of a KMS Key to use that key to encrypt the state.