diff --git a/src/windows/new_ride.c b/src/windows/new_ride.c
index 0e1acc21eb..032df21a2c 100644
--- a/src/windows/new_ride.c
+++ b/src/windows/new_ride.c
@@ -320,6 +320,7 @@ static void window_new_ride_populate_list()
 
 				quadIndex = rideEntryIndex >> 5;
 				bitIndex = rideEntryIndex & 0x1F;
+				// Skip if vehicle type is not invented yet
 				if (!(RCT2_ADDRESS(0x01357424, uint32)[quadIndex] & (1 << bitIndex)))
 					continue;
 
diff --git a/src/windows/ride.c b/src/windows/ride.c
index 93d2cd5585..96b1a2d869 100644
--- a/src/windows/ride.c
+++ b/src/windows/ride.c
@@ -2330,6 +2330,7 @@ static void window_ride_vehicle_mousedown(int widgetIndex, rct_window *w, rct_wi
 
 			quadIndex = rideEntryIndex >> 5;
 			bitIndex = rideEntryIndex & 0x1F;
+			// Skip if vehicle type is not invented yet
 			if (!(RCT2_ADDRESS(0x01357424, uint32)[quadIndex] & (1 << bitIndex)))
 				continue;