diff --git a/README.md b/README.md
index 8869600..dd682e0 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,13 @@ My personal dotfiles as a flake.
 
 Structure:
 
-```
+```text
 ├── hosts                  # host configurations
 ├── lib                    # library functions
-├── modules                       
+├── modules
 │   ├── darwin             # reusable modules for macOS
+│   ├── nixos              # reusable modules for nixOS
+│   ├── system             # reusable modules for unix-like systems (nixOS, darwin, etc.)
 │   └── home               # reusable modules for home manager
 ├── users                  # user configurations (can be shared across hosts)
 └── vendor                 # vendored flake dependencies in git submodules
diff --git a/devenv.nix b/devenv.nix
index f1046b4..df79ebc 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -1,4 +1,11 @@
 { ... }: {
   languages.nix.enable = true;
-  pre-commit.hooks.nixfmt-classic.enable = true;
+  pre-commit.hooks = {
+    nixfmt-classic.enable = true;
+    markdownlint = {
+      enable = true;
+      settings.configuration = { MD013.line_length = 120; };
+    };
+    shellcheck.enable = true;
+  };
 }
diff --git a/modules/home/default/gh.zsh b/modules/home/default/gh.zsh
index 43a3bd3..91fdb88 100644
--- a/modules/home/default/gh.zsh
+++ b/modules/home/default/gh.zsh
@@ -1,3 +1,5 @@
+# shellcheck disable=all
+
 ghcs() {
 	FUNCNAME="$funcstack[1]"
 	TARGET="shell"