diff --git a/package.json b/package.json
index 5f5949d..35e0cce 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,8 @@
     "flux",
     "normalize",
     "denormalize",
-    "json"
+    "json",
+    "immutable"
   ],
   "files": [
     "immutable/",