--- a/README.md	Fri Feb 27 17:03:15 2015 +0200
+++ b/README.md	Fri Feb 27 17:05:08 2015 +0200
@@ -214,6 +214,28 @@
     2                                 PTR   bar.test.
     5                                 PTR   quux.asdf.test.
 
+## Source zone files
+
+The zonefile header should be written out manually, using an `$INCLUDE` directive to reference the (generated) hosts zonefile:
+
+    $ cat etc/zones/test 
+    $TTL 3600
+
+    @                   SOA     foo.test. hostmaster.test. (
+                                0               ; serial
+                                1d              ; refresh
+                                5m              ; retry
+                                10d             ; expiry
+                                300             ; negative
+                        )
+
+                        NS      foo
+                        NS      bar
+
+    $INCLUDE "forward/test"
+
+
+
 ## Usage
 
 ### `bin/update`
@@ -292,22 +314,6 @@
 * `SOA` record serial
 * `$INCLUDE` paths
 
-    $ cat etc/zones/test 
-    $TTL 3600
-
-    @                   SOA     foo.test. hostmaster.test. (
-                                0               ; serial
-                                1d              ; refresh
-                                5m              ; retry
-                                10d             ; expiry
-                                300             ; negative
-                        )
-
-                        NS      foo
-                        NS      bar
-
-    $INCLUDE "forward/test"
-
     $ bin/pvl.dns-process --serial $(date +%s) --include-path var/zones etc/zones/test 
     $TTL    3600
     @                                 SOA   foo.test. hostmaster.test. 1425049088 1d 5m 10d 300

--- a/bin/pvl.dns-serial	Fri Feb 27 17:03:15 2015 +0200
+++ b/bin/pvl.dns-serial	Fri Feb 27 17:05:08 2015 +0200
@@ -4,7 +4,6 @@
     Update zone serials.
 """
 
-
 import logging; log = logging.getLogger('main')
 import optparse
 import os.path