diff --git a/envoy/extensions/filters/http/stateful_session/v3/stateful_session.proto b/envoy/extensions/filters/http/stateful_session/v3/stateful_session.proto
index e3c612ed..aa07083f 100644
--- a/envoy/extensions/filters/http/stateful_session/v3/stateful_session.proto
+++ b/envoy/extensions/filters/http/stateful_session/v3/stateful_session.proto
@@ -23,6 +23,10 @@ message StatefulSession {
   //
   // [#extension-category: envoy.http.stateful_session]
   config.core.v3.TypedExtensionConfig session_state = 1;
+
+  // If set to True, the HTTP request must be routed to the requested destination.
+  // If the requested destination is not available, Envoy returns 503. Defaults to False.
+  bool strict = 2;
 }
 
 message StatefulSessionPerRoute {
diff --git a/envoy/extensions/http/stateful_session/header/v3/header.proto b/envoy/extensions/http/stateful_session/header/v3/header.proto
index 01b9381b..c5e7de1c 100644
--- a/envoy/extensions/http/stateful_session/header/v3/header.proto
+++ b/envoy/extensions/http/stateful_session/header/v3/header.proto
@@ -23,7 +23,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // upstream host, this upstream host will be selected first. See :ref:`stateful session filter
 // <envoy_v3_api_msg_extensions.filters.http.stateful_session.v3.StatefulSession>`.
 //
-// For example, if the header name is set to ``session-header``, envoy will prefer ``1.2.3.4:80``
+// For example, if the header name is set to ``session-header``, Envoy will prefer ``1.2.3.4:80``
 // as the upstream host when the request contains the following header:
 //
 // .. code-block:: none