diff --git a/docs/manual/CoreTypes/custom-programming.html b/docs/manual/CoreTypes/custom-programming.html
index d6c1e9830..b87dd8ebe 100644
--- a/docs/manual/CoreTypes/custom-programming.html
+++ b/docs/manual/CoreTypes/custom-programming.html
@@ -56,7 +56,7 @@ package com.mydomain;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.taskdefs.condition.Condition;
 
-public class AllUpperCaseCondition extends Condition {
+public class AllUpperCaseCondition implements Condition {
     private String value;
 
     // The setter for the "value" attribute