diff --git a/config/nginx.sample.conf b/config/nginx.sample.conf
index 41771cc2e..e13774c08 100644
--- a/config/nginx.sample.conf
+++ b/config/nginx.sample.conf
@@ -50,8 +50,11 @@ server {
       #  return 403;
       #}
 
-      # let NGINX serve images
+      # custom CSS
+      location ~ /stylesheet-cache/ { try_files $uri =404; }
+      # images
       location ~* \.(gif|png|jpg|jpeg|bmp|tif|tiff)$ { try_files $uri =404; }
+      # thumbnails & optimized images
       location ~ /_optimized/ { try_files $uri =404; }
 
       # attachments must go through the rails application to get the right content-disposition header