diff --git a/docs/NetfilterOverview.xml b/docs/NetfilterOverview.xml
index 010aacc43..ff7710073 100644
--- a/docs/NetfilterOverview.xml
+++ b/docs/NetfilterOverview.xml
@@ -89,8 +89,8 @@
Shorewall system itself.
A more elaborate version of this flow is available here
- and this one
+ url="http://jengelh.medozas.de/images/nf-packet-flow.png">here and
+ this one
contrasts the Netfilter flow with that of ipchains.
In the above diagram are boxes similar to this: