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diff --git a/HOWTO b/HOWTO
index 342bad80..8fad2ce6 100644
--- a/HOWTO
+++ b/HOWTO
@@ -2862,7 +2862,15 @@ Measurements and reporting
 
 .. option:: clat_percentiles=bool
 
-	Enable the reporting of percentiles of completion latencies.
+	Enable the reporting of percentiles of completion latencies.  This
+	option is mutually exclusive with :option:`lat_percentiles`.
+
+.. option:: lat_percentiles=bool
+
+	Enable the reporting of percentiles of IO latencies. This is similar
+	to :option:`clat_percentiles`, except that this includes the
+	submission latency. This option is mutually exclusive with
+	:option:`clat_percentiles`.
 
 .. option:: percentile_list=float_list