diff --git a/library/include/mobilisis/calculator_functions.h b/library/include/mobilisis/calculator_functions.h
index 4b09771..dc5b2e1 100644
--- a/library/include/mobilisis/calculator_functions.h
+++ b/library/include/mobilisis/calculator_functions.h
@@ -30,4 +30,12 @@ public:
 
     // Daily ticket
     QDateTime GetDailyTicketDuration(Configuration* cfg, const QDateTime start_datetime, uint8_t payment_option, bool carry_over);
+
+
+    //
+    // helper functions for Schoenau
+    //
+    QList<int> GetTimeSteps(Configuration const *cfg, int paymentOption);
+    //
+    double GetPriceForTimeStep(Configuration const *cfg, int paymentOption, int timeStep);
 };