diff --git a/src/domain.cpp b/src/domain.cpp
index 49114ed..d874ea9 100644
--- a/src/domain.cpp
+++ b/src/domain.cpp
@@ -54,4 +54,11 @@ bool operator!= (const Domain &domain1, const Domain &domain2)
     return !(domain1 == domain2);
 }
 
+
+QDebug operator<<(QDebug dbg, const Domain &domain)
+{
+    dbg.nospace() << "Domain("<<domain.m_minX<<','<<domain.m_maxX<<','<<domain.m_minY<<','<<domain.m_maxY<<')';
+    return dbg.maybeSpace();
+}
+
 QTCOMMERCIALCHART_END_NAMESPACE
diff --git a/src/domain_p.h b/src/domain_p.h
index e4f8ffc..db0c5ca 100644
--- a/src/domain_p.h
+++ b/src/domain_p.h
@@ -15,6 +15,7 @@ public:
 
 	friend bool operator== (const Domain &domain1, const Domain &domain2);
 	friend bool operator!= (const Domain &domain1, const Domain &domain2);
+	friend QDebug operator<<(QDebug dbg, const Domain &domain);
 
 	Domain subDomain(const QRectF& rect, qreal maxWidth, qreal maxHeight) const;