diff --git a/doc/hamnet70.adoc b/doc/hamnet70.adoc
index 985da6f..64fb67d 100644
--- a/doc/hamnet70.adoc
+++ b/doc/hamnet70.adoc
@@ -2,6 +2,7 @@
 Thomas Kolb DL5TKL
 0.1, 2024-04-25
 :toc:
+:stem:
 
 // SPDX-License-Identifier: CC-BY-SA-4.0
 // List of contributors is at the end of the document.