diff --git a/README.md b/README.md
old mode 100644
new mode 100755
index 0e2d71fb..2602c814
--- a/README.md
+++ b/README.md
@@ -42,6 +42,14 @@ module.exports = {
 
 Then you only need to write: `require("./file.scss")`. See [`node-sass`](https://github.com/andrew/node-sass) for the available options.
 
+### async/sync
+
+By default, all processing is done **asynchronously** unless the `sync` parameter is passed
+
+``` javascript
+var css = require("!raw!sass?sync!./file.scss");
+```
+
 ## Install
 
 `npm install sass-loader`
diff --git a/index.js b/index.js
old mode 100644
new mode 100755
index be2ca18e..fceda367
--- a/index.js
+++ b/index.js
@@ -5,11 +5,15 @@ var sassGraph = require('sass-graph');
 
 module.exports = function (content) {
     this.cacheable();
-    var callback = this.async();
 
     var opt = utils.parseQuery(this.query);
     opt.data = content;
 
+    var callback = function() {};
+    if (opt.sync !== true) {
+        callback = this.async();
+    }
+
     // skip empty files, otherwise it will stop webpack, see issue #21
     if (opt.data.trim() === '') {
         return callback(null, content);
@@ -39,16 +43,23 @@ module.exports = function (content) {
         } 
     }.bind(this);
 
-    opt.success = function (css) {
+    if (opt.sync === true) {
+        var css = sass.renderSync(opt);
         markDependencies();
-        callback(null, css);
-    }.bind(this);
+        return css;
+    }
+    else {
+        opt.success = function (css) {
+            markDependencies();
+            callback(null, css);
+        }.bind(this);
 
-    opt.error = function (err) {
-        markDependencies();
-        this.emitError(err);
-        callback(err);
-    }.bind(this);
+        opt.error = function (err) {
+            markDependencies();
+            this.emitError(err);
+            callback(err);
+        }.bind(this);
 
-    sass.render(opt);
+        sass.render(opt);
+    }
 };