diff --git README.txt README.txt
index 266b33d..f2220f0 100644
--- README.txt
+++ README.txt
@@ -66,6 +66,19 @@ A: You will need to convert those relative URLs ('images/mypic.jpg') to absolute
    module (http://drupal.org/project/pathologic) for exactly this problem.
 
 
+VARNISH
+-------
+
+If you're using Varnish you need to allow the FeedBurner UserAgent to pass through the
+cache.
+
+Example snippet for the Varnish .vcl to accomplish this:
+
+    if (req.http.user-agent ~ "FeedBurner") {
+      return (pass);
+    }
+
+
 KNOWN ISSUES
 ------------