grammar: remove unnecessary comma in compound predicate

diff --git a/docs/dnssec/modes-of-operation.rst b/docs/dnssec/modes-of-operation.rst
index a7c365b4c2ea8cdc0dbec02692b8b853382852c6..0040dfba296c087f7a3d87b44fba16da8373470e 100644 (file)
--- a/docs/dnssec/modes-of-operation.rst
+++ b/docs/dnssec/modes-of-operation.rst
@@ -85,7 +85,7 @@ records, are calculated on the fly, and heavily cached. All CPU cores
 are used for the calculation.
 
 RRSIGs have a validity period. In PowerDNS, the RRSIG validity period is 3 weeks.
-This period starts at most a week in the past, and continues at least a week into the future.
+This period starts at most a week in the past and continues at least a week into the future.
 This interval jumps with one-week increments every Thursday.
 
 The time period used is always calculated based on the moment of rollover.