diff --git a/doc/reference/src/expressions.xml b/doc/reference/src/expressions.xml
index bfda5125..82f66390 100644
--- a/doc/reference/src/expressions.xml
+++ b/doc/reference/src/expressions.xml
@@ -379,7 +379,7 @@ bool falseValue = (bool) ExpressionEvaluator.GetValue(ieee, expression);</progra
         <emphasis>and</emphasis>, <emphasis>or</emphasis>, <emphasis>xor</emphasis> and <emphasis>not</emphasis>. Their use is demonstrated below.
 Note, that the logical and bitwise operators are the same and their interpretation depends if you pass in integral values or boolean values.
 <programlisting language="csharp">// AND
-int result = (int) ExpressionEvaluator.GetValue(null, "1 and 3"); // 1 & 3
+int result = (int) ExpressionEvaluator.GetValue(null, "1 and 3"); // 1 &amp; 3
 
 // OR
 int result = (int) ExpressionEvaluator.GetValue(null, "1 or 3");  // 1 | 3
@@ -389,6 +389,7 @@ int result = (int) ExpressionEvaluator.GetValue(null, "1 xor 3");  // 1 ^ 3
 
 // NOT
 int result = (int) ExpressionEvaluator.GetValue(null, "!1"); // ~1
+</programlisting>
         </para>
       </sect3>