diff --git a/reference/speeduino.ini b/reference/speeduino.ini
index b426e675..699f91d4 100644
--- a/reference/speeduino.ini
+++ b/reference/speeduino.ini
@@ -474,7 +474,7 @@ page = 7
 ; dialogs can be nested and can be mixed with fields
 
     dialog = engine_constants_south
-        field = "Injector Timing", injTiming
+        field = "Injector Timing", injTiming,           { nCylinders <= 4 }
         field = "Board Layout", pinLayout
 
     dialog = engine_constants, ""