diff --git a/DockerSwarm/exercise.adoc b/DockerSwarm/exercise.adoc
index 571155a..c116da2 100644
--- a/DockerSwarm/exercise.adoc
+++ b/DockerSwarm/exercise.adoc
@@ -158,12 +158,12 @@ image:swarmlab-network.png[alt="Vlab Network"]
 **    https://github.com/oren/docker-cordova
 **    https://github.com/walterwhites/docker-cordova
 
-=== MuseScore + Lilypond (music engraving program)
-* MuseScore + Lilypond
-**   https://github.com/ericfont/MuseScore
-** http://lilypond.org/
-** https://musescore.org/en
-** https://github.com/markauskas/docker-lilypond
+=== visualization software
+* Graphviz + PlantUML - https://en.wikipedia.org/wiki/PlantUML, https://en.wikipedia.org/wiki/Unified_Modeling_Language, https://en.wikipedia.org/wiki/Graphviz
+**   https://github.com/plantuml/plantuml-server
+** https://github.com/emfloyd2/docker-graphviz
+** https://github.com/omerio/graphviz-server
+
 
 == Q&A
 [qanda]