diff --git a/flake.nix b/flake.nix
index 1b4e87b..ecffc44 100644
--- a/flake.nix
+++ b/flake.nix
@@ -28,23 +28,24 @@
               [
                 alejandra
                 ccls
+                chafa
                 gopls
+                haskell-language-server
                 luaformatter
+                lua-language-server
                 nixd
                 nixfmt-rfc-style
                 pyright
                 rust-analyzer
-                lua-language-server
                 svls
                 texlab
-                tree-sitter
                 tinymist
+                tree-sitter
+                ueberzugpp
                 verible
+                viu
                 yaml-language-server
                 zls
-                viu
-                chafa
-                ueberzugpp
               ]
               ++ [ neovim ];
           };
diff --git a/nvim-lsp.nix b/nvim-lsp.nix
index 46713cd..e5b08d3 100644
--- a/nvim-lsp.nix
+++ b/nvim-lsp.nix
@@ -1,4 +1,5 @@
-{pkgs}: let
+{ pkgs }:
+let
   neovim = pkgs.neovim.override {
     configure = {
       customRC = ''
@@ -12,6 +13,7 @@
           parsers.c
           parsers.cpp
           parsers.go
+          parsers.haskell
           parsers.json
           parsers.latex
           parsers.lua
@@ -43,7 +45,7 @@
         vim-slime
         vim-snippets
         zig-vim
-	nvim-web-devicons
+        nvim-web-devicons
       ];
     };
   };
@@ -51,7 +53,7 @@
   # lua
   luaRc = builtins.readFile ./vimrc.lua;
 in
-  pkgs.runCommand "nvim-lsp" {} ''
-    mkdir -p $out/bin
-    ln -s ${neovim}/bin/nvim $out/bin/vim
-  ''
+pkgs.runCommand "nvim-lsp" { } ''
+  mkdir -p $out/bin
+  ln -s ${neovim}/bin/nvim $out/bin/vim
+''
diff --git a/vimrc.lua b/vimrc.lua
index ecd7bf7..505d3f7 100644
--- a/vimrc.lua
+++ b/vimrc.lua
@@ -215,7 +215,7 @@ vim.lsp.config('nixd', {
 		},
 	},
 })
-vim.lsp.enable('nixd');
+vim.lsp.enable('nixd')
 
 vim.lsp.config('lua_ls', {
 	capabilities = capabilities,
@@ -241,13 +241,19 @@ vim.lsp.config('lua_ls', {
 		},
 	},
 })
-vim.lsp.enable('lua_ls');
+vim.lsp.enable('lua_ls')
 
 vim.lsp.config('verible', {
 	capabilities = capabilities,
 	root_dir = function() return vim.fn.getcwd() end
 })
-vim.lsp.enable('verible');
+vim.lsp.enable('verible')
+
+vim.lsp.config('hls', {
+	capabilities = capabilities,
+	filetypes = { 'haskell', 'lhaskell', 'cabal' },
+})
+vim.lsp.enable('hls')
 
 if vim.fn.exists('+undofile') ~= 0 then
 	local undo_dir = vim.env.HOME .. '/.config/nvim/undo'