diff --git a/usr.bin/vmstat/vmstat.8 b/usr.bin/vmstat/vmstat.8
index 4c21b9a76dcd..ff1edb841fd3 100644
--- a/usr.bin/vmstat/vmstat.8
+++ b/usr.bin/vmstat/vmstat.8
@@ -181,7 +181,7 @@ id	cpu idle
 .fi
 .RE
 .SH EXAMPLES
-The command ``vmstat -i 5'' will print what the system is doing every five
+The command ``vmstat -w 5'' will print what the system is doing every five
 seconds; this is a good choice of printing interval since this is how often
 some of the statistics are sampled in the system.
 Others vary every second and running the output for a while will make it