diff --git a/website/content/docs/api-clients/api/index.mdx b/website/content/docs/api-clients/api/index.mdx
index db307b5ea5..6fb380d20e 100644
--- a/website/content/docs/api-clients/api/index.mdx
+++ b/website/content/docs/api-clients/api/index.mdx
@@ -89,6 +89,7 @@ Responses may contain the following headers:
 
 - `RateLimit` - Provides the current limit, number of remaining requests, and the time at which the quota will reset for the limit that is closest to being exhausted for the requested resource and action.
 - `RateLimit-Policy` - Describes the limits for the requested resource and action.
+- `x-correlation-id` - Indicates that an API request that came in to Boundary is also related to an audit event in Vault.
 
 ## Manage system resources