diff --git a/README.md b/README.md
index 13f5b351..1a3a5f52 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ const ast = parse(JSON_BUFFER, {verbose: true, junker: true});
 assert(ast instanceof AST.JsonDocument);
 
 const visitor = new MyVisitor();
-ast.visit(visitor);
+ast.accept(visitor);
 assert.deepEqual(visitor.comments, [" Some comment"]);
 
 // One can also the `JsonNode.toJSON` static method to convert to a JavaScript object
diff --git a/package.json b/package.json
index 124438b6..a75f9ce7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,10 @@
 {
   "name": "json-ast",
   "version": "2.1.7",
+  "engines": {
+    "node": "^4.9.1",
+    "npm": "^2.15.11"
+  },
   "description": "JSON parser AST utilities",
   "author": "Romain Gaucher",
   "homepage": "https://github.com/neuroo/json-ast",