diff --git a/Overall-architecture.md b/Overall-architecture.md
index e587f97..f6aeba1 100644
--- a/Overall-architecture.md
+++ b/Overall-architecture.md
@@ -537,6 +537,7 @@ Results of tasks are sent back in YAML format compressed into archive. This arch
 List of items from results file. Mandatory items are bold, optional ones italic.
 
 - **job-id** -- identification of job to which this results belongs
+- **hw-group** -- Hardware group identifier of worker which performed the evaluation
 - _error_message_ -- present only if whole execution failed and none of tasks were executed
 - **results** -- list of tasks results
 	- **task-id** -- unique identification of task in scope of this job
@@ -558,6 +559,7 @@ List of items from results file. Mandatory items are bold, optional ones italic.
 ```{.yml}
 ---
 job-id: 5
+hw-group: "group1"
 results:
 	- task-id: compile1
 	  status: OK