diff --git a/container/Chat.nix b/container/Chat.nix
new file mode 100644
index 0000000..8bf839f
--- /dev/null
+++ b/container/Chat.nix
@@ -0,0 +1,57 @@
+{
+  container,
+  lib,
+  config,
+  ...
+}:
+let
+  cfg = config.container.module.chat;
+in
+{
+  options = {
+    container.module.chat = {
+      enable = lib.mkEnableOption "chat container.";
+      address = lib.mkOption {
+        default = "10.1.0.20";
+        type = lib.types.str;
+      };
+      port = lib.mkOption {
+        default = 80;
+        type = lib.types.int;
+      };
+      domain = lib.mkOption {
+        default = "chat.${config.container.domain}";
+        type = lib.types.str;
+      };
+      storage = lib.mkOption {
+        default = "${config.container.storage}/chat";
+        type = lib.types.str;
+      };
+    };
+  };
+
+  # WIP: https://search.nixos.org/options?channel=24.05&from=0&size=50&sort=relevance&type=packages&query=mattermost
+  config = lib.mkIf cfg.enable {
+    systemd.tmpfiles.rules = container.mkContainerDir cfg [ "data" ];
+
+    containers.chat = container.mkContainer cfg {
+      bindMounts = {
+        # "/var/lib/changedetection-io" = {
+        #   hostPath = "${cfg.storage}/data";
+        #   isReadOnly = false;
+        # };
+      };
+
+      config =
+        { ... }:
+        container.mkContainerConfig cfg {
+          # services.changedetection-io = {
+          #   enable = true;
+          #   baseURL = cfg.domain;
+          #   behindProxy = true;
+          #   listenAddress = cfg.address;
+          # };
+        };
+    };
+  };
+}