diff --git a/tutorial/step_2_business_language/src/Morphir/Example/App/Rentals.elm b/tutorial/step_2_business_language/src/Morphir/Example/App/Rentals.elm
index c82dde9..737e84d 100644
--- a/tutorial/step_2_business_language/src/Morphir/Example/App/Rentals.elm
+++ b/tutorial/step_2_business_language/src/Morphir/Example/App/Rentals.elm
@@ -27,6 +27,9 @@ decide windCategory forecastDetail inventory probableReservations returns reques
     if isClosed then
         Err ClosedDueToConditions
 
+    else if availability == 0 then
+        Err InsufficientAvailability
+
     else if requestedQuantity <= availability then
         Ok requestedQuantity