diff --git a/package.json b/package.json
index 26fb3c9..76a7d9b 100644
--- a/package.json
+++ b/package.json
@@ -61,6 +61,7 @@
     "style-loader": "^0.13.0",
     "ts-helper": "0.0.1",
     "ts-node": "^0.5.5",
+    "tsd": "^0.6.5",
     "tslint": "^3.5.0",
     "tslint-loader": "^2.1.3",
     "typedoc": "^0.3.12",