grammar: comma for introductory phrase

diff --git a/docs/dnssec/modes-of-operation.rst b/docs/dnssec/modes-of-operation.rst
index 1f6f42ad6107c184b3140824ff7472706c4be0a2..487784d93cf178464170fbf842e5b69630458dd8 100644 (file)
--- a/docs/dnssec/modes-of-operation.rst
+++ b/docs/dnssec/modes-of-operation.rst
@@ -46,7 +46,7 @@ Zone Signing Keys (ZSKs). During normal operations, this means that only
 
 Should it be desired to 'roll over' to a new key, both keys can
 temporarily be active (and used for signing), and after a while, the old
-key can be deactivated. Subsequently it can be removed.
+key can be deactivated. Subsequently, it can be removed.
 
 As described above, there are several ways in which DNSSEC can deny the
 existence of a record, and this setting, which is also stored away from zone