diff --git a/src/ldtk/Json.hx b/src/ldtk/Json.hx
index 1c2eb5f..800688a 100644
--- a/src/ldtk/Json.hx
+++ b/src/ldtk/Json.hx
@@ -925,6 +925,9 @@ typedef AutoLayerRuleGroupJson = {
 
 	@added("1.4.2")
 	var requiredBiomeValues: Array<String>;
+
+	@added("1.4.2")
+	var biomeRequirementMode: Int;
 }
 
 /**