diff --git a/sites-available/example.com b/sites-available/example.com
index bc56697..0ae72f2 100644
--- a/sites-available/example.com
+++ b/sites-available/example.com
@@ -14,9 +14,9 @@ server {
 }
 
 server {
-  # listen 80 default_server deferred; # for Linux
-  # listen 80 default_server accept_filter=httpready; # for FreeBSD
-  listen 80 default_server;
+  # listen 80 deferred; # for Linux
+  # listen 80 accept_filter=httpready; # for FreeBSD
+  listen 80;
 
   # The host name to respond to
   server_name example.com;
diff --git a/sites-available/no-default b/sites-available/no-default
index 9b8f8ab..908b468 100644
--- a/sites-available/no-default
+++ b/sites-available/no-default
@@ -1,3 +1,10 @@
+# Drop requests for unknown hosts
+#
+# If no default server is defined, nginx will use the first found server.
+# To prevent host header attacks, or other potential problems when an unknown 
+# servername is used in a request, it's recommended to drop the request 
+# returning 444 "no response".
+
 server {
   listen 80 default_server;
   return 444;