diff --git a/nixops/common-users.nix b/nixops/common-users.nix
index c65cdac..6add85a 100644
--- a/nixops/common-users.nix
+++ b/nixops/common-users.nix
@@ -70,6 +70,13 @@
       "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBAlWtaDQ3yZTfiIWSPCWtP+mwj/vGKrxWu7vMhx6vQQ7ix1Bndou4Y+7KERu7nmWqXWhq3i+s8MELyWcLkGWLrg0l3IR5DPA9QXQ+3bt/pc8wbC3uzXIfjkTZ0fQaJjFMw=="
     ];
   };
+  ychenfo = {
+    isNormalUser = true;
+    extraGroups = ["plugdev" "dialout"];
+    openssh.authorizedKeys.keys = [
+      "ecdsa-sha2-nistp384 AAAAE2VjZHNhLXNoYTItbmlzdHAzODQAAAAIbmlzdHAzODQAAABhBJDEHOerlYRjkTaaa9HLLjTRuLAkPdhcRiizUkmANKgKdO17xZ7Or05dAGeeivv+TEmJShSK0EljhGv/+pTHrf/L0d7pExSjyb0m08iYb8gLCoQVx7hcFLIGiYnNoLab9g=="
+    ];
+  };
 
   dpn = {
     isNormalUser = true;