diff --git a/home/david/configurations/Tytonidae/default.nix b/home/david/configurations/Tytonidae/default.nix
index 3c3d736..3b3c345 100644
--- a/home/david/configurations/Tytonidae/default.nix
+++ b/home/david/configurations/Tytonidae/default.nix
@@ -20,6 +20,11 @@
   youthlic.programs = {
     helix.enable = true;
     gpg.enable = true;
+    git = {
+      email = "uilc.youthilc@gmail.com";
+      name = "ulic-youthlic";
+      signKey = "C6FCBD7F49E1CBBABD6661F7FC02063F04331A95";
+    };
   };
 
   xdg.userDirs = {
@@ -38,11 +43,6 @@
   home.homeDirectory = "/home/${unixName}";
   home.stateVersion = "24.11";
   programs.home-manager.enable = true;
-  programs.git = {
-    enable = true;
-    userName = "Ulic-youthlic";
-    userEmail = "ulic.youthlic@gmail.com";
-  };
   programs.obs-studio = {
     enable = true;
     plugins = with pkgs.obs-studio-plugins; [
diff --git a/home/modules/default.nix b/home/modules/default.nix
index 8db7e5a..6969b1e 100644
--- a/home/modules/default.nix
+++ b/home/modules/default.nix
@@ -8,6 +8,7 @@
       ./nix.nix
       ./helix
       ./gpg
+      ./git.nix
     ];
 
   options = {
diff --git a/home/modules/git.nix b/home/modules/git.nix
new file mode 100644
index 0000000..00b0c7b
--- /dev/null
+++ b/home/modules/git.nix
@@ -0,0 +1,54 @@
+{ config, lib, ... }:
+{
+  options = {
+    youthlic.programs.git = {
+      email = lib.mkOption {
+        type = lib.types.str;
+        description = ''
+          git email
+        '';
+      };
+      name = lib.mkOption {
+        type = lib.types.str;
+        example = ''youthlic'';
+        description = ''
+          git name
+        '';
+      };
+      signKey = lib.mkOption {
+        type = lib.types.addCheck (lib.types.nullOr lib.types.str) (
+          x: (x == null || config.youthlic.programs.gpg.enable)
+        );
+        default = null;
+        description = ''
+          key fingerprint for sign commit
+        '';
+      };
+    };
+  };
+  config =
+    let
+      cfg = config.youthlic.programs.git;
+    in
+    {
+      programs.lazygit = {
+        enable = true;
+      };
+      programs.git = lib.mkMerge [
+        {
+          enable = true;
+          userEmail = cfg.email;
+          userName = cfg.name;
+          delta = {
+            enable = true;
+          };
+        }
+        (lib.mkIf (cfg.signKey != null) {
+          signing = {
+            signByDefault = true;
+            key = cfg.signKey;
+          };
+        })
+      ];
+    };
+}