diff --git a/README.txt b/README.txt
index 9a854b6..e5c0d13 100644
--- a/README.txt
+++ b/README.txt
@@ -315,11 +315,14 @@ http://drupal.org/node/1116618
 
     ###
     ### advagg_css and advagg_js support
+    ###   if etags are enabled (not default), turn them off for advagg files.
+    ###   if http://wiki.nginx.org/HttpHeadersMoreModule is installed use this:
+    ###     more_clear_headers "ETag"
     ###
-    location ~* advagg_(?:css|js)/ {
-        access_log off;
-        expires 365d;
-        add_header Pragma "";
-        add_header Cache-Control "public";
-        try_files $uri @drupal;
+    location ~* files/advagg_(?:css|js)/ {
+      access_log off;
+      expires    max;
+      add_header Cache-Control "max-age=290304000, no-transform, public";
+      add_header Last-Modified "Wed, 20 Jan 1988 04:20:42 GMT";
+      try_files  $uri @drupal;
     }