diff --git a/docs/ant_task_guidelines.html b/docs/ant_task_guidelines.html
index 3dd47b449..7666f56fc 100644
--- a/docs/ant_task_guidelines.html
+++ b/docs/ant_task_guidelines.html
@@ -124,7 +124,7 @@ The test cases are a great way of testing your task during development.
 A simple call to 'ant run-test' in the ant source tree will run all ant
 tests, to verify that your changes don't break anything.
 To test a single task, use the one shot <code>ant run-single-test
-${testname}</code> where ${testname} is the name of your test class.
+-Dtestcase=${testname}</code> where ${testname} is the name of your test class.
 
 
 <p>