diff --git a/library/include/mobilisis/duration.h b/library/include/mobilisis/duration.h
index e903843..86625df 100644
--- a/library/include/mobilisis/duration.h
+++ b/library/include/mobilisis/duration.h
@@ -1,11 +1,37 @@
 #include <string>
 
+#include <QDebug>
+
 class ATBDuration
 {
 public:
+    explicit ATBDuration()
+      : pun_id(0)
+      , pun_label("")
+      , pun_duration(0)
+      , pun_duration_min(0)
+      , pun_duration_max(0)
+      , pun_interpolation_id(-1) {
+    }
+
+    friend QDebug operator<<(QDebug debug, ATBDuration const &td) {
+        QDebugStateSaver saver(debug);
+
+        debug.nospace()
+            << "              pun_id: " << td.pun_id << "\n"
+            << "           pun_label: " << QString::fromStdString(td.pun_label) << "\n"
+            << "        pun_duration: " << td.pun_duration << "\n"
+            << "    pun_duration_min: " << td.pun_duration_min << "\n"
+            << "    pun_duration_max: " << td.pun_duration_max << "\n"
+            << "pun_interpolation_id: " << td.pun_interpolation_id << "\n";
+
+        return debug;
+    }
+
 	int pun_id;
 	std::string pun_label;
 	int pun_duration;
     int pun_duration_min;
     int pun_duration_max;
+    int pun_interpolation_id;
 };