diff --git a/init.lua b/init.lua
index e8cd132..5c440f5 100644
--- a/init.lua
+++ b/init.lua
@@ -826,6 +826,24 @@ vim.api.nvim_create_autocmd('BufEnter', {
 		vim.opt_local.formatoptions:append("t")
 	end,
 })
+local function toggle_checkbox()
+  local line = vim.api.nvim_get_current_line()
+  local new
+  if line:match('%[ %]') then
+    new = line:gsub('%[ %]', '[x]', 1)
+  elseif line:match('%[x%]') then
+    new = line:gsub('%[x%]', '[ ]', 1)
+  elseif line:match('^(%s*[-*+])%s+(.*)') then
+    -- bare list item → promote to checkbox
+    new = line:gsub('^(%s*[-*+])%s+', '%1 [ ] ', 1)
+  else
+    return
+  end
+  vim.api.nvim_set_current_line(new)
+end
+
+vim.keymap.set('n', '<leader>tc', toggle_checkbox,
+  { desc = 'Toggle markdown checkbox', buffer = false })
 
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