diff --git a/README.md b/README.md
index a88a9e6..5531f3a 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,10 @@ If you want to use a different extension, do:
 
 `require('node-jsx').install({extension: '.jsx'})`
 
+If you want to define specific paths where files are located, for optimization reasons, do:
+
+`require('node-jsx').install({paths: [path.resolve(__dirname, 'app')]})`
+
 If you want to couple with an additional transform (such as CoffeeScript), do:
 
 ```
diff --git a/index.js b/index.js
index 1b19b6a..dde6446 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,6 @@
 var fs = require('fs');
 var jstransform = require('jstransform/simple');
+var path = require('path');
 
 var installed = false;
 
@@ -10,22 +11,37 @@ function install(options) {
 
   options = options || {};
 
+  // Check if module being loaded is in a path
+  var isInPaths = function (paths, filename) {
+   return !!paths.filter(function (path) {
+      return filename.indexOf(path) === 0;
+    }).length; 
+  };
+
   // Import everything in the transformer codepath before we add the import hook
   jstransform.transform('', options);
 
   require.extensions[options.extension || '.js'] = function(module, filename) {
+
+    var src = fs.readFileSync(filename, {encoding: 'utf8'});
+
+    if (options.paths && !isInPaths(options.paths, filename)) {
+      return module._compile(src, filename);
+    }
+
     if (!options.hasOwnProperty("react"))
       options.react = true;
 
-    var src = fs.readFileSync(filename, {encoding: 'utf8'});
     if (typeof options.additionalTransform == 'function') {
       src = options.additionalTransform(src);
     }
+
     try {
       src = jstransform.transform(src, options).code;
     } catch (e) {
       throw new Error('Error transforming ' + filename + ' to JS: ' + e.toString());
     }
+    
     module._compile(src, filename);
   };
 
diff --git a/node-jsx-path-invalid.spec.js b/node-jsx-path-invalid.spec.js
new file mode 100644
index 0000000..5862452
--- /dev/null
+++ b/node-jsx-path-invalid.spec.js
@@ -0,0 +1,8 @@
+describe('node-jsx', function() {
+  it('should not work on wrong paths passed', function() {
+    require('./index').install({
+      paths: ['somepath']
+    });
+    expect(require.bind(null, './test-module')).toThrow();
+  });
+});
diff --git a/node-jsx-path-valid.spec.js b/node-jsx-path-valid.spec.js
new file mode 100644
index 0000000..b7ddef4
--- /dev/null
+++ b/node-jsx-path-valid.spec.js
@@ -0,0 +1,10 @@
+var path = require('path');
+
+describe('node-jsx', function() {
+  it('should work only on paths passed', function() {
+    require('./index').install({
+      paths: [__dirname]
+    });
+    expect(require('./test-module').indexOf('data-reactid')).toBeGreaterThan(-1);
+  });
+});
diff --git a/package.json b/package.json
index e52aa4e..b4d49fb 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "react": "^0.13.2"
   },
   "scripts": {
-    "test": "jasmine-node node-jsx.spec.js"
+    "test": "jasmine-node node-jsx.spec.js && jasmine-node node-jsx-path-valid.spec.js && jasmine-node node-jsx-path-invalid.spec.js"
   },
   "repository": "petehunt/node-jsx",
   "author": "Pete Hunt",