diff --git a/README.md b/README.md
index 6b64e42..e9461b3 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,13 @@ Default: `undefined`
 
 npm registry to install the package from. By default it uses the default npm registry.
 
+#### resolve
+
+Type: `string` `string[]`<br>
+Default: `undefined`
+
+Extra folders to resolve local node_modules from.
+
 ## Contributing
 
 1. Fork it!
diff --git a/cli.js b/cli.js
index 12bc03e..aa44aa2 100755
--- a/cli.js
+++ b/cli.js
@@ -123,6 +123,10 @@ cli
   .option('--analyze', 'Analyze bundled files')
   .option('--port <port>', 'Port to start analyze on. Defaults to 8888')
   .option('--registry <registry>', 'npm registry URL to install from')
+  .option(
+    '--resolve <directory>',
+    'Extra folders to resolve local node_modules from'
+  )
   .example(`  package-size react,react-dom`)
   .example(`  package-size styled-jsx/style --externals react`)
   .example(`  package-size ./dist/my-bundle.js`)
diff --git a/lib/index.js b/lib/index.js
index d789ab7..a608ce5 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -95,6 +95,10 @@ module.exports = co.wrap(function*(name, opts = {}) {
   if (yarnGlobal.inDirectory(__dirname)) {
     config.resolve.modules.push(path.join(yarnGlobal.getDirectory()))
   }
+  
+  if (opts.resolve) {
+    config.resolve.modules = config.resolve.modules.concat(opts.resolve)
+  }
 
   if (isCwd) {
     config.resolve.modules.unshift(path.join(process.cwd(), 'node_modules'))