diff --git a/System-configuration.md b/System-configuration.md
index ab71bd9..e5cd5f7 100644
--- a/System-configuration.md
+++ b/System-configuration.md
@@ -56,7 +56,8 @@ of the particular worker instance.
   case the worker's defaults will be set as the maximum for the job. Also,
   limits in job configuration cannot exceed limits from worker.
 - **max-output-length** -- used for `tasks.{task}.sandbox.output` option, defined
-  in bytes
+  in bytes, applied to both stdout and stderr and is not divided, both will get
+  this value
 
 ### Example config file