diff --git a/website/content/api-docs/index.mdx b/website/content/api-docs/index.mdx
index 7821bfae6c..fde1141f33 100644
--- a/website/content/api-docs/index.mdx
+++ b/website/content/api-docs/index.mdx
@@ -304,6 +304,7 @@ warnings are generated during the operation.
 - `473` - Default return code for health status of performance standby nodes.
 - `500` - Internal server error. An internal error has occurred, try again
   later. If the error persists, report a bug.
+- `501` - Vault is not initialized.
 - `502` - A request to Vault required Vault making a request to a third party;
   the third party responded with an error of some kind.
 - `503` - Vault is down for maintenance or is currently sealed. Try again