Allow setting serial manually
diff --git a/bind/files/db.zone b/bind/files/db.zone
index d96e9f9..d7d5fef 100644
--- a/bind/files/db.zone
+++ b/bind/files/db.zone
@@ -3,13 +3,13 @@
 $ORIGIN {{ name }}
 $TTL {{ zone.get('ttl', '86400') }}
 
-{{ name }}		IN SOA	{{ name }}. {{ zone.get('root', 'hostmaster.'+name)|replace('@', '.') }}. (
-				1        ; serial
-				{{ zone.get('refresh', 604800) }}
-				{{ zone.get('retry', 86400) }}
-				{{ zone.get('expire', 2419200) }}
-				{{ zone.get('minimum', 86400) }}
-				)
+{{ name }}              IN SOA  {{ name }}. {{ zone.get('root', 'hostmaster.'+name)|replace('@', '.') }}. (
+                                {{ zone.get('serial', 1) }}
+                                {{ zone.get('refresh', 604800) }}
+                                {{ zone.get('retry', 86400) }}
+                                {{ zone.get('expire', 2419200) }}
+                                {{ zone.get('minimum', 86400) }}
+                                )
 
 {%- for record in zone.get('records', []) %}
 {{ record.get('name', '@') }} {{ record.get('ttl', '') }} {{ type }} {% if type in ['TXT', 'SPF'] %}"{{ value }}"{% else %}{{ value }}{% endif %}