diff --git a/Miscellaneous/web/http-request-headers/http-request-headers-fields-large.txt b/Miscellaneous/web/http-request-headers/http-request-headers-fields-large.txt
index 2204701f..ab94c153 100644
--- a/Miscellaneous/web/http-request-headers/http-request-headers-fields-large.txt
+++ b/Miscellaneous/web/http-request-headers/http-request-headers-fields-large.txt
@@ -744,6 +744,7 @@ Ua-Voice
 Unauthorized
 Unencoded-Url
 Unit-Test-Mode
+UniqueId
 Unless-Modified-Since
 Unprocessable-Entity
 Unsupported-Media-Type