diff --git a/index.html b/index.html
index 61d4a38..88b4d65 100644
--- a/index.html
+++ b/index.html
@@ -27,7 +27,10 @@ appearing in the book
 In addition,
 <a href="http://lightuml.sourceforge.net/">LightUML</a>
 integrates UMLGraph into <a href="http://www.eclipse.org">Eclipse</a>,
-and <a href="http://maven-plugins.sourceforge.net/maven-dotuml-plugin/">Dotuml</a> integrates UMLGraph into <a href="http://maven.apache.org/">Maven</a>.
+<a href="http://maven-plugins.sourceforge.net/maven-dotuml-plugin/">Dotuml</a>
+integrates UMLGraph into <a href="http://maven.apache.org/">Maven</a>,
+and the <a href="http://sourceforge.net/projects/xholon/">Xholon</a>
+framework uses UMLGraph to generate its runtime sequence diagrams.
 Furthermore,
 the Politecnico Di Torino SoftEng group has extended UMLGraph into
 the <a href="http://softeng.polito.it/projects/XUG/">XUG</a>
diff --git a/web/index.html b/web/index.html
index 61d4a38..88b4d65 100644
--- a/web/index.html
+++ b/web/index.html
@@ -27,7 +27,10 @@ appearing in the book
 In addition,
 <a href="http://lightuml.sourceforge.net/">LightUML</a>
 integrates UMLGraph into <a href="http://www.eclipse.org">Eclipse</a>,
-and <a href="http://maven-plugins.sourceforge.net/maven-dotuml-plugin/">Dotuml</a> integrates UMLGraph into <a href="http://maven.apache.org/">Maven</a>.
+<a href="http://maven-plugins.sourceforge.net/maven-dotuml-plugin/">Dotuml</a>
+integrates UMLGraph into <a href="http://maven.apache.org/">Maven</a>,
+and the <a href="http://sourceforge.net/projects/xholon/">Xholon</a>
+framework uses UMLGraph to generate its runtime sequence diagrams.
 Furthermore,
 the Politecnico Di Torino SoftEng group has extended UMLGraph into
 the <a href="http://softeng.polito.it/projects/XUG/">XUG</a>