diff --git a/envoy/extensions/filters/http/kill_request/v3/kill_request.proto b/envoy/extensions/filters/http/kill_request/v3/kill_request.proto
index 989239b3..c5b082ac 100644
--- a/envoy/extensions/filters/http/kill_request/v3/kill_request.proto
+++ b/envoy/extensions/filters/http/kill_request/v3/kill_request.proto
@@ -19,10 +19,19 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 
 // Configuration for KillRequest filter.
 message KillRequest {
+  // On which direction should the filter check for the `kill_request_header`.
+  // Default to `REQUEST` if unspecified.
+  enum Direction {
+    REQUEST = 0;
+    RESPONSE = 1;
+  }
+
   // The probability that a Kill request will be triggered.
   type.v3.FractionalPercent probability = 1;
 
   // The name of the kill request header. If this field is not empty, it will override the :ref:`default header <config_http_filters_kill_request_http_header>` name. Otherwise the default header name will be used.
   string kill_request_header = 2
       [(validate.rules).string = {well_known_regex: HTTP_HEADER_VALUE strict: false}];
+
+  Direction direction = 3 [(validate.rules).enum = {defined_only: true}];
 }