diff -up procps-3.2.7/vmstat.8.timestamp procps-3.2.7/vmstat.8
--- procps-3.2.7/vmstat.8.timestamp	2009-02-03 12:32:27.000000000 +0100
+++ procps-3.2.7/vmstat.8	2009-02-03 12:34:37.000000000 +0100
@@ -8,6 +8,7 @@ vmstat \- Report virtual memory statisti
 .B vmstat
 .RB [ "\-a" ]
 .RB [ "\-n" ]
+.RB [ "\-t" ]
 .RI [ delay " [ " count ]]
 .br
 .B vmstat
@@ -43,7 +44,9 @@ equivalent to the total number of tasks 
 is represented by one or more tasks, depending on thread usage.
 This display does not repeat.
 .PP
-The \fB-m\fP displays slabinfo.
+The \fB-t\fP switch adds timestamp to the output.
+.PP
+The \fB-m\fP switch displays slabinfo.
 .PP
 The \fB-n\fP switch causes the header to be displayed only once rather than periodically.
 .PP