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diff --git a/.config/nvim/lsp/arduino_language_server.lua b/.config/nvim/lsp/arduino_language_server.lua
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+---@brief
+---
+--- https://github.com/arduino/arduino-language-server
+---
+--- Language server for Arduino
+---
+--- The `arduino-language-server` can be installed by running:
+---
+--- ```
+--- go install github.com/arduino/arduino-language-server@latest
+--- ```
+---
+--- The `arduino-cli` tool must also be installed. Follow [these
+--- installation instructions](https://arduino.github.io/arduino-cli/latest/installation/) for
+--- your platform.
+---
+--- After installing `arduino-cli`, follow [these
+--- instructions](https://arduino.github.io/arduino-cli/latest/getting-started/#create-a-configuration-file)
+--- for generating a configuration file if you haven't done so already, and make
+--- sure you [install any relevant platforms
+--- libraries](https://arduino.github.io/arduino-cli/latest/getting-started/#install-the-core-for-your-board).
+---
+--- The language server also requires `clangd` to be installed. Follow [these
+--- installation instructions](https://clangd.llvm.org/installation) for your
+--- platform.
+---
+--- If you don't have a sketch yet create one.
+---
+--- ```sh
+--- $ arduino-cli sketch new test
+--- $ cd test
+--- ```
+---
+--- You will need a `sketch.yaml` file in order for the language server to understand your project. It will also save you passing options to `arduino-cli` each time you compile or upload a file. You can generate the file by using the following commands.
+---
+---
+--- First gather some information about your board. Make sure your board is connected and run the following:
+---
+--- ```sh
+--- $ arduino-cli board list
+--- Port         Protocol Type              Board Name  FQBN            Core
+--- /dev/ttyACM0 serial   Serial Port (USB) Arduino Uno arduino:avr:uno arduino:avr
+--- ```
+---
+--- Then generate the file:
+---
+--- ```sh
+--- arduino-cli board attach -p /dev/ttyACM0 -b arduino:avr:uno test.ino
+--- ```
+---
+--- The resulting file should look like this:
+---
+--- ```yaml
+--- default_fqbn: arduino:avr:uno
+--- default_port: /dev/ttyACM0
+--- ```
+---
+--- Your folder structure should look like this:
+---
+--- ```
+--- .
+--- ├── test.ino
+--- └── sketch.yaml
+--- ```
+---
+--- For further instructions about configuration options, run `arduino-language-server --help`.
+---
+--- Note that an upstream bug makes keywords in some cases become undefined by the language server.
+--- Ref: https://github.com/arduino/arduino-ide/issues/159
+
+local util = require 'lspconfig.util'
+
+---@type vim.lsp.Config
+return {
+  filetypes = { 'arduino' },
+  root_dir = function(bufnr, on_dir)
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    on_dir(util.root_pattern('*.ino')(fname))
+  end,
+  cmd = {
+    'arduino-language-server',
+  },
+  capabilities = {
+    textDocument = {
+      semanticTokens = vim.NIL,
+    },
+    workspace = {
+      semanticTokens = vim.NIL,
+    },
+  },
+}