diff --git a/README.md b/README.md
index f6e2b13..60cecd2 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,24 @@
 # nix-environments
 
-some personal flakes
\ No newline at end of file
+some personal flakes
+
+# usage
+
+### create a new dir
+
+```bash
+nix flake new -t https://git.elisiei.xyz:elisiei/nix-environments#ENV_HERE
+```
+
+### or init an existing dir
+
+```bash
+nix flake init -t https://git.elisiei.xyz:elisiei/nix-environments#ENV_HERE
+```
+
+# license
+
+all original content and codes in this project is dedicated to the public domain under the
+[Creative Commons CC0 1.0 Universal (CC0 1.0) Public Domain Dedication](https://creativecommons.org/publicdomain/zero/1.0/).
+this grants you the freedom to use, modify, and distribute the content without any restrictions
+or attribution requirements.
diff --git a/go/.envrc b/go/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/go/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/go/.gitignore b/go/.gitignore
new file mode 100644
index 0000000..50b5dca
--- /dev/null
+++ b/go/.gitignore
@@ -0,0 +1,33 @@
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Code coverage profiles and other test artifacts
+*.out
+coverage.*
+*.coverprofile
+profile.cov
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+.direnv
+
+# Editor/IDE
+# .idea/
+# .vscode/
diff --git a/go/flake.nix b/go/flake.nix
new file mode 100644
index 0000000..d689e7f
--- /dev/null
+++ b/go/flake.nix
@@ -0,0 +1,45 @@
+{
+  description = "minimal flake for go dev";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1";
+
+  outputs =
+    inputs:
+    let
+      goVersion = 24;
+
+      supportedSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forEachSupportedSystem =
+        f:
+        inputs.nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import inputs.nixpkgs {
+              inherit system;
+              overlays = [ inputs.self.overlays.default ];
+            };
+          }
+        );
+    in
+    {
+      overlays.default = final: prev: {
+        go = final."go_1_${toString goVersion}";
+      };
+
+      devShells = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              go
+            ];
+          };
+        }
+      );
+    };
+}