diff --git a/types/gloas/request_auth.yaml b/types/gloas/request_auth.yaml
index e40d1f21..bb49749e 100644
--- a/types/gloas/request_auth.yaml
+++ b/types/gloas/request_auth.yaml
@@ -11,8 +11,9 @@ Gloas:
           Opaque authentication data unique to the builder, agreed upon out of band. The meaning of
           the up to `MAX_BUILDER_AUTH_DATA_SIZE` (4096) bytes is left to the two parties; the builder checks the
           exact bytes when it verifies. When no value has been agreed out of band, implementations
-          SHOULD default to the UTF-8 bytes of the builder's own advertised URL, exactly as
-          advertised, so proposers with no prior relationship can construct an identical `data`
+          SHOULD default to the builder's hostname derived from its URL, see
+          [default auth data](https://github.com/ethereum/builder-specs/blob/main/specs/gloas/validator.md#default-auth-data),
+          so proposers with no prior relationship can construct an identical `data`
           deterministically. A zero-length `data` is invalid.
         example: "0x1234567890abcdef"
         pattern: "^0x(?:[a-fA-F0-9]{2}){1,4096}$"