title: Obj-C @synthesize
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c">Prefixing property names with an underscore in Objective C</a>  </p>
  </blockquote>
  
  
  
  <p>iPhone App Developer Beginner here:</p>
  
  <p>in .h</p>
  
  <pre><code>@property (nonatomic, retain) IBOutlet UILabel *detailDescriptionLabel;
  </code></pre>
  
  <p>in .m</p>
  
  <pre><code>@synthesize detailDescriptionLabel = _detailDescriptionLabel;
  </code></pre>
  
  <p>I'm used to seeing</p>
  
  <pre><code>@synthesize detailDescriptionLabel;
  </code></pre>
  
  <p>the <code>= _</code> is throwing me off, what is this doing?</p>