diff --git a/doc/PROTOCOL-WEB.md b/doc/PROTOCOL-WEB.md
index 0b54e0f34fc7ebe2ef2ae300982a8098956bf24d..5f01af362734d0e319d96362a097a66eb295860a 100644
--- a/doc/PROTOCOL-WEB.md
+++ b/doc/PROTOCOL-WEB.md
@@ -94,8 +94,6 @@ the response stream needs to be text encoded e.g. when XHR is used or due
 to security policies with XHR
   * Accept: application/grpc-web-text
 2. The default text encoding is base64
-  * Text encoding may be specified with Content-Type or Accept headers as
-      * application/grpc-web-text-base64
   * Note that “Content-Transfer-Encoding: base64” should not be used.
   Due to in-stream base64 padding when delimiting messages, the entire
   response body is not necessarily a valid base64-encoded entity