grammar: avoid using having

diff --git a/docs/dnssec/modes-of-operation.rst b/docs/dnssec/modes-of-operation.rst
index 0040dfba296c087f7a3d87b44fba16da8373470e..2124774f08bf651d259272b93eb9fb8b2e31fa29 100644 (file)
--- a/docs/dnssec/modes-of-operation.rst
+++ b/docs/dnssec/modes-of-operation.rst
@@ -115,8 +115,8 @@ At all times, only one RRSIG per signed RRset per ZSK is served when responding
 .. note::
   Why Thursday? POSIX-based operating systems count the time
   since GMT midnight January 1st of 1970, which was a Thursday. PowerDNS
-  inception/expiration times are generated based on an integral number of
-  weeks having passed since the start of the 'epoch'.
+  inception/expiration times are generated based on the integral number of
+  weeks since the start of the 'epoch'.
 
 PowerDNS also serves the DNSKEY records in live-signing mode. Their TTL
 is derived from the SOA records *minimum* field. When using NSEC3, the