diff --git a/src/index.html b/src/index.html
index a7be81b..6a789b6 100644
--- a/src/index.html
+++ b/src/index.html
@@ -398,6 +398,7 @@
 							<option value="sass">SASS</option>
 							<option value="less">LESS</option>
 							<option value="stylus">Stylus</option>
+							<option value="acss">Atomic CSS</option>
 						</select>
 						<select style="flex:1;margin:0 20px" data-setting="jsMode" d-change="updateSetting">
 							<option value="js">JS</option>