diff --git a/.gitignore b/.gitignore
index 26bc69fe7..dd1f3077d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ bundle.js
 *-error.log
 *-debug.log
 .vscode
+.DS_Store
diff --git a/packages/remark-mdx/package.json b/packages/remark-mdx/package.json
index 36d9edbab..ec1096038 100644
--- a/packages/remark-mdx/package.json
+++ b/packages/remark-mdx/package.json
@@ -22,7 +22,8 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
   ],
   "files": [
-    "index.js"
+    "index.js",
+    "tag.js"
   ],
   "dependencies": {
     "is-alphabetical": "^1.0.2",