diff --git a/api/envoy/service/ext_proc/v3/external_processor.proto b/api/envoy/service/ext_proc/v3/external_processor.proto
index aa62ef74226d..a6e146bf8027 100644
--- a/api/envoy/service/ext_proc/v3/external_processor.proto
+++ b/api/envoy/service/ext_proc/v3/external_processor.proto
@@ -203,7 +203,6 @@ message HttpHeaders {
   // :ref:`value <envoy_v3_api_field_config.core.v3.HeaderValue.value>` field.
   config.core.v3.HeaderMap headers = 1;
 
-  // [#not-implemented-hide:]
   // The values of properties selected by the ``request_attributes``
   // or ``response_attributes`` list in the configuration. Each entry
   // in the list is populated