diff --git a/.config/nvim/lua/lspconfig/ltex.lua b/.config/nvim/lua/lspconfig/ltex.lua
new file mode 100644
index 0000000..d5aa384
--- /dev/null
+++ b/.config/nvim/lua/lspconfig/ltex.lua
@@ -0,0 +1,111 @@
+local M = {}
+
+M.file = {
+  dictionary = vim.fn.stdpath('config') .. '/spell/en.utf-8.add',
+  disabledRules = vim.fn.stdpath('config') .. '/spell/disable.txt',
+  hiddenFalsePositives = vim.fn.stdpath('config') .. '/spell/false.txt',
+}
+
+local file_exists = function(file)
+  local f = io.open(file, 'rb')
+  if f then
+    f:close()
+  end
+  return f ~= nil
+end
+
+M.lines_from = function(file)
+  if not file_exists(file) then
+    return {}
+  end
+  local lines = {}
+  for line in io.lines(file) do
+    table.insert(lines, line)
+  end
+  return lines
+end
+
+local get_client_by_name = function(name)
+  local buf_clients = vim.lsp.buf_get_clients()
+  for _, client in ipairs(buf_clients) do
+    if client.name == name then
+      return client
+    end
+  end
+  return nil
+end
+
+local update_config = function(lang, configtype)
+  local client = get_client_by_name('ltex')
+  if client then
+    if client.config.settings.ltex[configtype] then
+      client.config.settings.ltex[configtype] = {
+        [lang] = M.lines_from(M.file[configtype]),
+      }
+      return client.notify('workspace/didChangeConfiguration', client.config.settings)
+    else
+      return vim.notify('Error when reading dictionary config, check it')
+    end
+  else
+    return nil
+  end
+end
+
+local add_to_file = function(configtype, lang, file, value)
+  local dict = M.lines_from(file)
+  for _, v in ipairs(dict) do
+    if v == value then
+      return nil
+    end
+  end
+  file = io.open(file, 'a+')
+  if file then
+    file:write(value .. '\n')
+    file:close()
+  else
+    return vim.notify(string.format('Failed insert %s', value))
+  end
+  return update_config(lang, configtype)
+end
+
+local do_command = function(arg, configtype)
+  for lang, words in pairs(arg) do
+    for _, word in ipairs(words) do
+      add_to_file(configtype, lang, M.file[configtype], word)
+    end
+  end
+end
+
+vim.lsp.commands['_ltex.addToDictionary'] = function(command, _)
+  do_command(command.arguments[1].words, 'dictionary')
+end
+vim.lsp.commands['_ltex.disableRules'] = function(command, _)
+  do_command(command.arguments[1].ruleIds, 'disabledRules')
+end
+vim.lsp.commands['_ltex.hideFalsePositives'] = function(command, _)
+  do_command(command.arguments[1].falsePositives, 'hiddenFalsePositives')
+end
+
+M.on_attach = function()
+  vim.cmd('setlocal spell')
+  vim.cmd('setlocal nospell')
+  update_config('en-US', 'dictionary')
+  update_config('en-US', 'disabledRules')
+  update_config('en-US', 'hiddenFalsePositives')
+  vim.keymap.set('n', 'zug', function()
+    vim.cmd('normal! zug')
+    update_config('en-US', 'dictionary')
+  end, {
+    buffer = true,
+    desc = 'Remove word from spellfile and update ltex',
+  })
+  vim.keymap.set('n', 'zg', function()
+    vim.cmd('normal! zg')
+    update_config('en-US', 'dictionary')
+  end, {
+    buffer = true,
+    desc = 'Add word to spellfile and update ltex',
+  })
+end
+
+return M
diff --git a/.config/nvim/lua/lspconfig/settings.lua b/.config/nvim/lua/lspconfig/settings.lua
index 80f4044..6d74d65 100644
--- a/.config/nvim/lua/lspconfig/settings.lua
+++ b/.config/nvim/lua/lspconfig/settings.lua
@@ -1,5 +1,7 @@
 local servers = { 'pyright', 'sumneko_lua', 'eslint', 'tsserver', 'ltex' }
 
+local ltex = require('lspconfig.ltex')
+
 -- Mappings.
 -- See `:help vim.diagnostic.*` for documentation on any of the below functions
 local opts = { noremap=true, silent=true }
@@ -10,7 +12,7 @@ vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
 
 -- Use an on_attach function to only map the following keys
 -- after the language server attaches to the current buffer
-local on_attach = function(client, bufnr)
+local on_attach = function(_, bufnr)
   -- Mappings.
   -- See `:help vim.lsp.*` for documentation on any of the below functions
   local bufopts = { noremap=true, silent=true, buffer=bufnr }
@@ -52,6 +54,28 @@ for _, lsp in pairs(servers) do
   }
 end
 
+require('lspconfig')['ltex'].setup {
+  on_attach = function(client)
+    on_attach(client)
+    ltex.on_attach()
+  end,
+  capabilities = capabilities,
+  flags = {
+    -- This will be the default in neovim 0.7+
+    debounce_text_changes = 150,
+  },
+  settings = {
+    ltex = {
+      dictionary = {},
+      disabledRules = {},
+      hiddenFalsePositives = {},
+      additionalRules = {
+        enablePickyRules = true,
+      },
+    },
+  },
+}
+
 -- luasnip setup
 local luasnip = require 'luasnip'
 require('luasnip.loaders.from_vscode').lazy_load()
diff --git a/.config/nvim/spell/.gitignore b/.config/nvim/spell/.gitignore
new file mode 100644
index 0000000..1bce8f8
--- /dev/null
+++ b/.config/nvim/spell/.gitignore
@@ -0,0 +1 @@
+false.txt
diff --git a/.config/nvim/spell/disable.txt b/.config/nvim/spell/disable.txt
new file mode 100644
index 0000000..bf9972e
--- /dev/null
+++ b/.config/nvim/spell/disable.txt
@@ -0,0 +1 @@
+PASSIVE_VOICE
diff --git a/.config/nvim/spell/en.utf-8.add b/.config/nvim/spell/en.utf-8.add
new file mode 100644
index 0000000..8381d96
--- /dev/null
+++ b/.config/nvim/spell/en.utf-8.add
@@ -0,0 +1,10 @@
+Read-Eval-Print-Loop
+Flexowriter
+Teitelman
+Interlisp
+JOHNNIAC
+REPLs
+Mathematica
+DSLs
+GPLs
+Plasil
diff --git a/.config/nvim/spell/en.utf-8.add.spl b/.config/nvim/spell/en.utf-8.add.spl
new file mode 100644
index 0000000..d6c3e5d
Binary files /dev/null and b/.config/nvim/spell/en.utf-8.add.spl differ