title: How to set keybinding in Neovim with 'Ctrl+/'
body: <p>Here is part of my config</p>
  <pre><code>local opts = { noremap = true, silent = true }
  local keymap = vim.api.nvim_set_keymap
  keymap(&quot;n&quot;,&quot;&lt;C-/&gt;&quot;,&quot;:lua require('Comment.api').toggle_current_linewise()&lt;CR&gt;&quot; ,opts)
  keymap(&quot;n&quot;,&quot;&lt;a-/&gt;&quot;,&quot;:lua require('Comment.api').toggle_current_linewise()&lt;CR&gt;&quot; ,opts)
  </code></pre>
  <p>keymap with <code>alt</code> works but with <code>ctrl</code> does not.
  I have other commands with <code>ctrl</code> and all of them work except this one</p>
  <pre><code>:verbose map &lt;C-/&gt;
      n  &lt;C-/&gt;       * :lua require('Comment.api').toggle_current_linewise()&lt;CR&gt;                                                                                                                                                       
              Last set from ~/.config/nvim/init.lua 
  </code></pre>
  <p>Any idea why it is not working ??</p>