grammar: oxford comma

diff --git a/docs/dnssec/modes-of-operation.rst b/docs/dnssec/modes-of-operation.rst
index e6f3381acb2e4b6c5492c6ec016f7fa30e9dc868..d886c0b5e6fc63301bfa04e7a6170903d517d302 100644 (file)
--- a/docs/dnssec/modes-of-operation.rst
+++ b/docs/dnssec/modes-of-operation.rst
@@ -18,7 +18,7 @@ Online Signing
 --------------
 
 In the simplest situation, there is a single "SQL" database that
-contains, in separate tables, all domain data, keying material and other
+contains, in separate tables, all domain data, keying material, and other
 DNSSEC related settings.
 
 This database is then replicated to all PowerDNS instances, which all