diff --git a/package.json b/package.json
index e2d7a73..c8314fb 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
   },
   "homepage": "https://github.com/rich-harris/rollup",
   "devDependencies": {
+    "console-group": "^0.1.1",
     "gobble": "^0.10.1",
     "gobble-babel": "^5.1.0",
     "gobble-cli": "^0.4.2",