diff --git a/plugins/inputs/system/DISK_README.md b/plugins/inputs/system/DISK_README.md
index b3b6a52fa55bdc513b028bcc028e250457e3409d..31eff937dad2746f2534544eaea16d13247b0b05 100644
--- a/plugins/inputs/system/DISK_README.md
+++ b/plugins/inputs/system/DISK_README.md
@@ -140,7 +140,7 @@ SELECT derivative(last("io_time"),1ms) FROM "diskio" WHERE time > now() - 30m GR
 #### Calculate average queue depth:
 `iops_in_progress` will give you an instantaneous value. This will give you the average between polling intervals.
 ```
-SELECT derivative(last("weighted_io_time",1ms))/1000 from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
+SELECT derivative(last("weighted_io_time",1ms)) from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
 ```
 
 ### Example Output: