diff --git a/package.json b/package.json
index 4d7a59b..ac34dcd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "json-rules-engine",
-  "version": "6.4.1",
+  "version": "6.4.2",
   "description": "Rules Engine expressed in simple json",
   "main": "dist/index.js",
   "types": "types/index.d.ts",
diff --git a/types/index.d.ts b/types/index.d.ts
index ec28eed..35b380a 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -1,6 +1,7 @@
 export interface EngineOptions {
   allowUndefinedFacts?: boolean;
   allowUndefinedConditions?: boolean;
+  replaceFactsInEventParams?: boolean;
   pathResolver?: PathResolver;
 }