diff --git a/envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto b/envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto
index 90f4b276..df141cb1 100644
--- a/envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto
+++ b/envoy/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto
@@ -979,7 +979,7 @@ message HttpFilter {
   // If true, clients that do not support this filter may ignore the
   // filter but otherwise accept the config.
   // Otherwise, clients that do not support this filter must reject the config.
-  // [#not-implemented-hide:]
+  // This is also same with typed per filter config.
   bool is_optional = 6;
 }
 
diff --git a/envoy/extensions/filters/network/http_connection_manager/v4alpha/http_connection_manager.proto b/envoy/extensions/filters/network/http_connection_manager/v4alpha/http_connection_manager.proto
index 4f61ffb8..37f15c7d 100644
--- a/envoy/extensions/filters/network/http_connection_manager/v4alpha/http_connection_manager.proto
+++ b/envoy/extensions/filters/network/http_connection_manager/v4alpha/http_connection_manager.proto
@@ -964,7 +964,7 @@ message HttpFilter {
   // If true, clients that do not support this filter may ignore the
   // filter but otherwise accept the config.
   // Otherwise, clients that do not support this filter must reject the config.
-  // [#not-implemented-hide:]
+  // This is also same with typed per filter config.
   bool is_optional = 6;
 }