diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 590362d..4759bca 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -788,6 +788,13 @@ in
         forceSSL = true;
         enableACME = true;
       };
+      "docs.m-labs.hk" = {
+        forceSSL = true;
+        enableACME = true;
+        locations."/".proxyPass = "http://127.0.0.1:9825";
+        locations."/socket.io/".proxyPass = "http://127.0.0.1:9825";
+        locations."/socket.io/".proxyWebsockets = true;
+      };
       "nmigen.org" = {
         addSSL = true;
         enableACME = true;
@@ -885,5 +892,18 @@ in
     config.adminpassFile = "/etc/nixos/secret/nextcloud_pass.txt";
   };
 
+  services.hedgedoc = {
+    enable = true;
+    configuration.port = 9825;
+    configuration.domain = "docs.m-labs.hk";
+    configuration.protocolUseSSL = true;
+    configuration.allowEmailRegister = false;
+    configuration.allowAnonymous = false;
+    configuration.db = {
+      dialect = "sqlite";
+      storage = "/var/lib/hedgedoc/db.hedgedoc.sqlite";
+    };
+  };
+
   system.stateVersion = "21.05";
 }
diff --git a/nixbld-etc-nixos/named/m-labs.hk b/nixbld-etc-nixos/named/m-labs.hk
index 382de84..ae6ce11 100644
--- a/nixbld-etc-nixos/named/m-labs.hk
+++ b/nixbld-etc-nixos/named/m-labs.hk
@@ -34,6 +34,7 @@ forum					CNAME	@
 perso					CNAME	@
 rt						CNAME	@
 files					CNAME	@
+docs					CNAME	@
 
 rpi-1					AAAA	2001:470:f821:1:dea6:32ff:fe8a:6a93
 rpi-2					AAAA	2001:470:f821:1:ba27:ebff:fef0:e9e6