diff --git a/chrony.spec b/chrony.spec
index 47e0b52..893ef3a 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -36,6 +36,9 @@ Requires(postun): systemd
 # install timedated implementation that can control chronyd service
 Recommends:     timedatex
 
+# suggest drivers for hardware reference clocks
+Suggests:       ntp-refclock
+
 %description
 A client/server for the Network Time Protocol, this program keeps your
 computer's clock accurate. It was specially designed to support