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+<h2>Custom Constraints (NUnit 2.4)</h2>
+
+<p>You can implement your own custom constraints by creating a class that 
+inherits from the <b>Constraint</b> abstract class, which supports performing a 
+test on an actual value and generating appropriate messages. The class includes
+two abstract methods, which you must override and two virtual methods which
+may be overridden as needed:
+   
+<div class="code" style="width: 36em">
+<pre>public abstract class Constraint
+{
+ 	...
+    public abstract bool Matches( object actual );
+    public abstract void WriteDescriptionTo( MessageWriter writer );
+    public virtual void WriteMessageTo( MessageWriter writer );
+    public virtual void WriteActualValueTo( MessageWriter writer );
+	...
+}</pre>
+</div>   
+
+<p>Your derived class should save the actual argument to Matches in the protected
+field actual for later use.
+
+<p>The MessageWriter abstract class is implemented in the framework by
+TextMessageWriter. Examining the source for some of the builtin constraints
+should give you a good idea of how to use it.
+
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