diff --git a/nixops/common-users.nix b/nixops/common-users.nix
index 6add85a..1623800 100644
--- a/nixops/common-users.nix
+++ b/nixops/common-users.nix
@@ -43,6 +43,13 @@
     ];
     shell = pkgs.zsh;
   };
+  occheung = {
+    isNormalUser = true;
+    extraGroups = ["plugdev" "dialout" "wireshark"];
+    openssh.authorizedKeys.keys = [
+      "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBPEvmWmxpFpMgp5fpjKud8ev0cyf/+X5fEpQt/YD/+u4mbvZYPE300DLqQ0h/qjgvaGMz1ndf4idYnRdy+plJEC/+hmlRW5NlcpAr3S/LYAisacgKToFVl+MlBo+emS9Ig=="
+    ];
+  };
   ak = {
     isNormalUser = true;
     openssh.authorizedKeys.keys = [