diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 751e1cc6a28..4706b20da31 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -767,7 +767,7 @@ enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
 static int timestamp_precision = TSP_USEC;
 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
     &timestamp_precision, 0, "File timestamp precision (0: seconds, "
-    "1: sec + ns accurate to 1/Hz, 2: sec + ns truncated to us, "
+    "1: sec + ns accurate to 1/HZ, 2: sec + ns truncated to us, "
     "3+: sec + ns (max. precision))");
 
 /*