diff --git a/config/.doom.d/config.el b/config/.doom.d/config.el
index b82b3b5..7ce999a 100644
--- a/config/.doom.d/config.el
+++ b/config/.doom.d/config.el
@@ -58,9 +58,20 @@
 ;;
 (global-wakatime-mode)
 
-(add-to-list 'auto-mode-alist '("\\.njk" . web-mode))
+;; haskell
 (setq lsp-haskell-formatting-provider "stylish-haskell")
+
+;; nix-mode
 (setq nix-nixfmt-bin "nixpkgs-fmt")
+(with-eval-after-load 'lsp-mode
+  (lsp-register-client
+   (make-lsp-client :new-connection (lsp-stdio-connection "nixd")
+                    :major-modes '(nix-mode)
+                    :priority 0
+                    :server-id 'nixd)))
+
+;; web-mode
+(add-to-list 'auto-mode-alist '("\\.njk" . web-mode))
 
 ;; TODO: remove when macport updates.
 ;; see: https://discourse.doomemacs.org/t/how-to-have-tool-bar-mode-0-apply-at-startup-to-avoid-large-title-bar-on-macos-sonoma-when-using-railwaycat-homebrew-emacsmacport/4222/4