diff --git a/docs/metric_types.md b/docs/metric_types.md
index e839cd07..53cdda23 100644
--- a/docs/metric_types.md
+++ b/docs/metric_types.md
@@ -22,7 +22,7 @@ Tells StatsD that this counter is being sent sampled every 1/10th of the time.
Timing
------
- glork:320|ms
+ glork:320|ms|@0.1
The glork took 320ms to complete this time. StatsD figures out percentiles,
average (mean), standard deviation, sum, lower and upper bounds for the flush interval.
@@ -67,6 +67,10 @@ Examples:
[ { metric: 'foo', bins: [] },
{ metric: '', bins: [ 50, 100, 150, 200, 'inf'] } ]
+Statsd also maintains a counter for each timer metric. The 3rd field
+specifies the sample rate for this counter (in this example @0.1). The field
+is optional and defaults to 1.
+
Note:
* first match for a metric wins.