diff --git a/features/websockets.yml b/features/websockets.yml
index 4249233358b..9112be22282 100644
--- a/features/websockets.yml
+++ b/features/websockets.yml
@@ -31,3 +31,8 @@ compat_features:
   - api.WebSocketError.WebSocketError
   - api.WebSocketError.closeCode
   - api.WebSocketError.reason
+  - http.headers.Sec-WebSocket-Accept
+  - http.headers.Sec-WebSocket-Extensions
+  - http.headers.Sec-WebSocket-Key
+  - http.headers.Sec-WebSocket-Protocol
+  - http.headers.Sec-WebSocket-Version
diff --git a/features/websockets.yml.dist b/features/websockets.yml.dist
index 021525e9056..e7e02cb5b31 100644
--- a/features/websockets.yml.dist
+++ b/features/websockets.yml.dist
@@ -93,6 +93,11 @@ compat_features:
   #   safari_ios: "6"
   - api.WebSocket.extensions
   - api.WebSocket.protocol_rfc_6455
+  - http.headers.Sec-WebSocket-Accept
+  - http.headers.Sec-WebSocket-Extensions
+  - http.headers.Sec-WebSocket-Key
+  - http.headers.Sec-WebSocket-Protocol
+  - http.headers.Sec-WebSocket-Version
 
   # baseline: high
   # baseline_low_date: 2015-07-29