diff --git a/dev/demo/relationsdemo.js b/dev/demo/relationsdemo.js
index 5c28f9a..17fcfb3 100644
--- a/dev/demo/relationsdemo.js
+++ b/dev/demo/relationsdemo.js
@@ -5,5 +5,32 @@
 require(['match/relations'], function (relClass) {
   var rel = relClass.create();
   document.getElementById("tree").appendChild(rel.element());
+
+  /*
+   * Start and end may be spans, i.e. arrays
+   */
+
+  rel
+    .addToken("Der")
+    .addToken("alte")
+    .addToken("Mann")
+    .addToken("ging")
+    .addToken("über")
+    .addToken("die")
+    .addToken("breite")
+    .addToken("nasse")
+    .addToken("Straße")
+  ;
+
+  rel
+    .addRel({ start: 0, end: 1, label: "a"})
+    .addRel({ start: 0, end: 1, label: "b" })
+    .addRel({ start: 1, end: 2, label: "c", direction: "bi"   })
+    .addRel({ start: 0, end: 2, label: "d" })
+    .addRel({ start: [2,4], end: 5, label: "e", direction: "uni"  })
+    .addRel({ start: [5,6], end: 7, label: "g" })
+    .addRel({ start: 4, end: [6,8], label: "f", direction: "bi" })
+  ;
+  
   rel.show();
 });