Update README

README.md

@@ -36,26 +36,43 @@ You can read more about these settings and others [over on the Autoprefixer page
 
 Autoprefixer doesn't play well with `.css.map` files, but it will work with embedded source maps. This means there are two options.
 
-If you want to disable CSS sourcemaps from ember-cli-sass update `ember-cli-build.js` to 
+If you want to disable CSS sourcemaps from ember-cli-sass update `ember-cli-build.js` to
 
 ```js
-    sassOptions: {
-      // This tells ember-cli-sass to avoid generating the sourcemap file (like vendor.css.map)
-      sourceMap: false
-    },
+  sassOptions: {
+    // This tells ember-cli-sass to avoid generating the sourcemap file (like vendor.css.map)
+    sourceMap: false
+  }
 ```
 
 Alternatively, you may use embedded source maps.  So we tell `ember-cli-sass` to embed the sourcemaps and then turn on sourcemaps with autoprefixer which will update the embedded sourcemap after adding prefixes.
 
 ```js
-    sassOptions: {
-      sourceMapEmbed: true
-    },
-    autoprefixer: {
-      enabled: true,
-      cascade: true,
-      sourcemap: true
-    }
+  sassOptions: {
+    sourceMapEmbed: true
+  },
+  autoprefixer: {
+    enabled: true,
+    cascade: true,
+    sourcemap: true
+  }
+```
+
+Also note you can optionally disable in production!
+
+```js
+  const envIsProduction = (process.env.EMBER_ENV === 'production');
+
+  ...
+
+  sassOptions: {
+    sourceMapEmbed: !envIsProduction
+  },
+  autoprefixer: {
+    enabled: true,
+    cascade: true,
+    sourcemap: !envIsProduction
+  }
 ```
 
 ## References