diff --git a/package.json b/package.json
index ef42dc9..ce94820 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,9 @@
     "uglify-js": "^2.4.23",
     "zoom.js": "fat/zoom.js"
   },
+  "napa": {
+    "underlinejs": "wentin/underlineJS"
+  },
   "devDependencies": {
     "autoprefixer": "5.2.0",
     "bourbon": "4.2.3",
@@ -42,6 +45,7 @@
     "metalsmith-tags": "0.10.1",
     "metalsmith-templates": "0.7.0",
     "metalsmith-typogr": "0.1.0",
+    "napa": "1.2.0",
     "node-sass": "3.2.0",
     "nodemon": "1.3.7",
     "normalize-opentype.css": "0.2.4",
@@ -53,7 +57,7 @@
   },
   "scripts": {
     "test": "echo \"Error: no test specified…yet! Pull requests on https://github.com/losttype/blog.losttype.com are greatly appreciated.\" && exit 1",
-    "postinstall": "cp ./node_modules/normalize.css/normalize.css ./node_modules/normalize.css/normalize.scss && cp ./node_modules/losttype-contributors/index.json ./src/authors.json",
+    "postinstall": "napa && cp ./node_modules/normalize.css/normalize.css ./node_modules/normalize.css/normalize.scss && cp ./node_modules/losttype-contributors/index.json ./src/authors.json",
     "build-html": "node_modules/metalsmith/bin/metalsmith",
     "build-css": "node-sass src/css/index.scss | autoprefixer > build/css/index.css",
     "build": "npm run build-html && npm run build-css",