title: git submodule update <name of submodule> - but still get modified: <name of submodule> (modified content)
body: <p>I have a submodule and when I do <code>git status</code> I get:</p>
  
  <pre><code>modified:   &lt;name of submodule&gt; (modified content)
  </code></pre>
  
  <p>I run:</p>
  
  <pre><code>git submodule update &lt;name of submodule&gt; 
  </code></pre>
  
  <p>but still get: </p>
  
  <pre><code>modified:   &lt;name of submodule&gt; (modified content)
  </code></pre>
  
  <p>Any idea why?</p>