diff --git a/ebpf/accesslog.proto b/ebpf/accesslog.proto
index 4155227..39d075e 100644
--- a/ebpf/accesslog.proto
+++ b/ebpf/accesslog.proto
@@ -99,6 +99,8 @@ message ZTunnelAttachmentEnvironment {
     ZTunnelAttachmentEnvironmentDetectBy by = 2;
     // the security policy of the ztunnel communicate with upstream
     ZTunnelAttachmentSecurityPolicy security_policy = 3;
+    // additional arguments
+    repeated KeyStringValuePair addition = 4;
 }
 
 enum ZTunnelAttachmentEnvironmentDetectBy {