diff --git a/index.js b/index.js
index 2ec6bfd..77e5efd 100644
--- a/index.js
+++ b/index.js
@@ -232,54 +232,49 @@ function forEachKeyedObject(obj, fn) {
   });
 }
 
-function requireDir(dir, basenames) {
+function requireDir(dir) {
   assert(dir, 'cannot require directory contents without directory name');
 
   var requires = {};
 
-  if (arguments.length === 2) {
-    // if basenames argument is passed, explicitly include those files
-    basenames.forEach(function (basename) {
-      var filepath = path.resolve(path.join(dir, basename));
-      requires[basename] = tryRequire(filepath);
-    });
-  } else if (arguments.length === 1) {
-    // if basenames arguments isn't passed, require all javascript
-    // files (except for those prefixed with _) and all directories
+  // require all javascript files (except for those prefixed with _)
+  // and all directories
 
-    var files = tryReadDir(dir);
+  var files = tryReadDir(dir);
 
-    // sort files in lowercase alpha for linux
-    files.sort(function (a,b) {
-      a = a.toLowerCase();
-      b = b.toLowerCase();
+  // sort files in lowercase alpha for linux
+  files.sort(function(a, b) {
+    a = a.toLowerCase();
+    b = b.toLowerCase();
 
-      if (a < b) {
-        return -1;
-      } else if (b < a) {
-        return 1;
-      } else {
-        return 0;
-      }
-    });
+    if (a < b) {
+      return -1;
+    } else if (b < a) {
+      return 1;
+    } else {
+      return 0;
+    }
+  });
 
-    files.forEach(function (filename) {
-      // ignore index.js and files prefixed with underscore
-      if ((filename === 'index.js') || (filename[0] === '_')) { return; }
+  files.forEach(function(filename) {
+    // ignore index.js and files prefixed with underscore
+    if ((filename === 'index.js') || (filename[0] === '_')) {
+      return;
+    }
 
-      var filepath = path.resolve(path.join(dir, filename));
-      var ext = path.extname(filename);
-      var stats = fs.statSync(filepath);
+    var filepath = path.resolve(path.join(dir, filename));
+    var ext = path.extname(filename);
+    var stats = fs.statSync(filepath);
 
-      // only require files supported by require.extensions (.txt .md etc.)
-      if (stats.isFile() && !(ext in require.extensions)) { return; }
+    // only require files supported by require.extensions (.txt .md etc.)
+    if (stats.isFile() && !(ext in require.extensions)) {
+      return;
+    }
 
-      var basename = path.basename(filename, ext);
+    var basename = path.basename(filename, ext);
 
-      requires[basename] = tryRequire(filepath);
-    });
-
-  }
+    requires[basename] = tryRequire(filepath);
+  });
 
   return requires;
 }