diff --git a/HOWTO b/HOWTO
index 483f68b..348b6c8 100644
--- a/HOWTO
+++ b/HOWTO
@@ -688,4 +688,7 @@
 		Completion latency: min, max, mean, deviation
 		Bw: min, max, aggregate percentage of total, mean, deviation
 	CPU usage: user, system, context switches
+	IO depths: <=1, 2, 4, 8, 16, 32, >=64
+	IO latencies: <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, >=2000
+	Text description