diff --git a/ptp4l.8 b/ptp4l.8
index e12542d..fadf854 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -193,8 +193,8 @@ The default is UDPv4.
 
 .TP
 .B twoStepFlag
-The local clock is a two-step clock if enabled. One-step clocks are not
-supported yet.
+Enable two-step mode for sync messages. One-step mode can be used only with
+hardware time stamping.
 The default is 1 (enabled).
 .TP
 .B slaveOnly