diff --git a/package.json b/package.json
index d709aae9..77d2e484 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
   },
   "files": [
     "dist",
-    "typings"
+    "typings",
+    "extend-expect.js"
   ],
   "keywords": [],
   "author": "Kent C. Dodds <kent@doddsfamily.us> (http://kentcdodds.com/)",
@@ -62,4 +63,4 @@
     "url": "https://github.com/kentcdodds/react-testing-library/issues"
   },
   "homepage": "https://github.com/kentcdodds/react-testing-library#readme"
-}
\ No newline at end of file
+}