What is the "S" in "npm i -S" : <p>I'm seeing this command on some packages and I wonder what the <code>-s</code> argument means, for example</p>

<pre><code>npm i -S classnames flexboxgrid
</code></pre>

<p>I mean, I know that, just like <code>i</code> is an abbreviation of <code>install</code>, it is an abbreviation of something, however I tried looking at <code>npm help</code>, <code>npm help help</code>, <code>npm apihelp npm</code>, <code>npm help npm</code>, nothing practically helpful there. This is like giving a dictionary to an illiterate; many words, but nothing about option arguments or their abbreviations.</p>
