diff --git a/src/town.h b/src/town.h
--- a/src/town.h
+++ b/src/town.h
@@ -35,7 +35,8 @@ static const uint INVALID_TOWN = 0xFFFF;
 
 static const uint TOWN_GROWTH_WINTER = 0xFFFFFFFE; ///< The town only needs this cargo in the winter (any amount)
 static const uint TOWN_GROWTH_DESERT = 0xFFFFFFFF; ///< The town needs the cargo for growth when on desert (any amount)
-static const uint16 TOWN_GROW_RATE_CUSTOM = 0x8000; ///< If this mask is applied to Town::grow_counter, the grow_counter will not be calculated by the system (but assumed to be set by scripts)
+static const uint16 TOWN_GROW_RATE_CUSTOM      = 0x8000; ///< If this mask is applied to Town::growth_rate, the grow_counter will not be calculated by the system (but assumed to be set by scripts)
+static const uint16 TOWN_GROW_RATE_CUSTOM_NONE = 0xFFFF; ///< Special value for Town::growth_rate to disable town growth.
 
 typedef Pool<Town, TownID, 64, 64000> TownPool;
 extern TownPool _town_pool;