SF #3024486: Add hint about debug compilation.
diff --git a/org.jacoco.doc/docroot/doc/ant.html b/org.jacoco.doc/docroot/doc/ant.html
index 8fccda1..41ccf9f 100644
--- a/org.jacoco.doc/docroot/doc/ant.html
+++ b/org.jacoco.doc/docroot/doc/ant.html
@@ -31,6 +31,12 @@
creates with the <a href="#report"><code>report</code></a> task.
</p>
+<p class="hint">
+ If you want to have line number information included in the coverage reports
+ or you want source code highlighting the class files of the test target must
+ be compiled with debug information.
+</p>
+
<h2>Example</h2>
<p>