diff --git a/doc/ver.xml b/doc/ver.xml
index ecf8e35..d432e4a 100644
--- a/doc/ver.xml
+++ b/doc/ver.xml
@@ -4,6 +4,10 @@
 <dl>
 
 <dt>Version 5.4 Under development </dt><dd>
+<ul>
+<li>Make the generation of diamond shapes compatible with GraphViz 2.27.
+(Contributed by Soraya Santana de la Fe.)</li>
+</ul>
 </dd>
 
 <dt>Version 5.3 2010-05-24</dt><dd>
diff --git a/src/org/umlgraph/doclet/ClassGraph.java b/src/org/umlgraph/doclet/ClassGraph.java
index 4fb6648..6589141 100644
--- a/src/org/umlgraph/doclet/ClassGraph.java
+++ b/src/org/umlgraph/doclet/ClassGraph.java
@@ -73,8 +73,8 @@ class ClassGraph {
     static {
 	associationMap.put(RelationType.ASSOC, "arrowhead=none");
 	associationMap.put(RelationType.NAVASSOC, "arrowhead=open");
-	associationMap.put(RelationType.HAS, "arrowhead=none, arrowtail=ediamond");
-	associationMap.put(RelationType.COMPOSED, "arrowhead=none, arrowtail=diamond");
+	associationMap.put(RelationType.HAS, "arrowhead=none, arrowtail=ediamond, dir=both");
+	associationMap.put(RelationType.COMPOSED, "arrowhead=none, arrowtail=diamond, dir=both");
 	associationMap.put(RelationType.DEPEND, "arrowhead=open, style=dashed");
     }
     protected Map<String, ClassInfo> classnames = new HashMap<String, ClassInfo>();