diff --git a/envoy/config/cluster/v3/filter.proto b/envoy/config/cluster/v3/filter.proto
index 30417997..54611edb 100644
--- a/envoy/config/cluster/v3/filter.proto
+++ b/envoy/config/cluster/v3/filter.proto
@@ -16,8 +16,8 @@ option java_multiple_files = true;
 option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3;clusterv3";
 option (udpa.annotations.file_status).package_version_status = ACTIVE;
 
-// [#protodoc-title: Upstream filters]
-// Upstream filters apply to the connections to the upstream cluster hosts.
+// [#protodoc-title: Upstream network filters]
+// Upstream network filters apply to the connections to the upstream cluster hosts.
 
 message Filter {
   option (udpa.annotations.versioning).previous_message_type = "envoy.api.v2.cluster.Filter";
@@ -28,7 +28,7 @@ message Filter {
   // Filter specific configuration which depends on the filter being
   // instantiated. See the supported filters for further documentation.
   // Note that Envoy's :ref:`downstream network
-  // filters <config_network_filters>` are not valid upstream filters.
+  // filters <config_network_filters>` are not valid upstream network filters.
   // Only one of typed_config or config_discovery can be used.
   google.protobuf.Any typed_config = 2;
 
diff --git a/envoy/extensions/filters/http/router/v3/router.proto b/envoy/extensions/filters/http/router/v3/router.proto
index 87ee2f0c..75bca960 100644
--- a/envoy/extensions/filters/http/router/v3/router.proto
+++ b/envoy/extensions/filters/http/router/v3/router.proto
@@ -122,16 +122,16 @@ message Router {
   // .. note::
   //   Upstream HTTP filters are currently in alpha.
   //
-  // Optional HTTP filters for the upstream filter chain.
+  // Optional HTTP filters for the upstream HTTP filter chain.
   //
   // These filters will be applied for all requests that pass through the router.
   // They will also be applied to shadowed requests.
-  // Upstream filters cannot change route or cluster.
-  // Upstream filters specified on the cluster will override these filters.
+  // Upstream HTTP filters cannot change route or cluster.
+  // Upstream HTTP filters specified on the cluster will override these filters.
   //
-  // If using upstream filters, please be aware that local errors sent by
-  // upstream filters will not trigger retries, and local errors sent by
-  // upstream filters will count as a final response if hedging is configured.
+  // If using upstream HTTP filters, please be aware that local errors sent by
+  // upstream HTTP filters will not trigger retries, and local errors sent by
+  // upstream HTTP filters will count as a final response if hedging is configured.
   // [#extension-category: envoy.filters.http.upstream]
   repeated network.http_connection_manager.v3.HttpFilter upstream_http_filters = 8;
 }
diff --git a/envoy/extensions/upstreams/http/v3/http_protocol_options.proto b/envoy/extensions/upstreams/http/v3/http_protocol_options.proto
index 1663fa4a..ca4cb81f 100644
--- a/envoy/extensions/upstreams/http/v3/http_protocol_options.proto
+++ b/envoy/extensions/upstreams/http/v3/http_protocol_options.proto
@@ -154,14 +154,14 @@ message HttpProtocolOptions {
   // .. note::
   //   Upstream HTTP filters are currently in alpha.
   //
-  // Optional HTTP filters for the upstream filter chain.
+  // Optional HTTP filters for the upstream HTTP filter chain.
   //
   // These filters will be applied for all HTTP streams which flow through this
-  // cluster. Unlike downstream filters, they will *not* be applied to terminated CONNECT requests.
+  // cluster. Unlike downstream HTTP filters, they will *not* be applied to terminated CONNECT requests.
   //
-  // If using upstream filters, please be aware that local errors sent by
-  // upstream filters will not trigger retries, and local errors sent by
-  // upstream filters will count as a final response if hedging is configured.
+  // If using upstream HTTP filters, please be aware that local errors sent by
+  // upstream HTTP filters will not trigger retries, and local errors sent by
+  // upstream HTTP filters will count as a final response if hedging is configured.
   // [#extension-category: envoy.filters.http.upstream]
   repeated filters.network.http_connection_manager.v3.HttpFilter http_filters = 6;