-<p>The @class syntax can also be used to extend existing classes in a manner similar to categories. Note that type signatures, however, are not yet supported, so you end up heavily restricted in what you can add via this mechanism. In this case, one can also use a parenthesized expression as the class name.</p>
+<p>The @implementation syntax can also be used to extend existing classes in the form of an Objective-C category. Note that type signatures, however, are not yet supported, so you end up heavily restricted in what you can add via this mechanism. In this case, one can also use a parenthesized expression as the class name.</p>