diff --git a/docs/manual/developlist.html b/docs/manual/developlist.html
index 370d8df9a..2b77430fa 100644
--- a/docs/manual/developlist.html
+++ b/docs/manual/developlist.html
@@ -13,7 +13,7 @@
 <h3>Developing with Ant</h3>
 
 <a href="develop.html#writingowntask">Writing Your Own Task</a><br>
-<a href="base_task_classes.html">Tasks Designed for Extensiton</a><br>
+<a href="base_task_classes.html">Tasks Designed for Extension</a><br>
 <a href="develop.html#buildevents">Build Events</a><br>
 <a href="develop.html#integration">Source-code Integration</a><br>
 <a href="inputhandler.html">InputHandler</a><br>