diff --git a/package.json b/package.json
index 080d9b1..e32198c 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,8 @@
     "underscore.string": "*"
   },
   "engines": {
-    "node": ">= 0.10.0",
+    "node": "~0.10.0 || ~0.12.0 || ~4.2.0",
+    "iojs": "~1.2.0",
     "npm": ">= 1.4.0"
   },
   "scripts": {