diff --git a/README.md b/README.md
index 862601c..7775557 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,10 @@ image uses significant content from the
 [hwraid](https://hwraid.le-vert.net/) page that we would like to thank
 for its years long contribution.
 
+See also the [ungleich hardware maintenance
+guide](https://redmine.ungleich.ch/projects/open-infrastructure/wiki/The_ungleich_hardware_maintenance_guide),
+which describes the use of various hardware raid tools.
+
 You can use this image from
 
 * ungleich/ungleich-hardware