diff --git a/Assignments-overview.md b/Assignments-overview.md
index 6e3f7b7..6c2505b 100644
--- a/Assignments-overview.md
+++ b/Assignments-overview.md
@@ -212,6 +212,7 @@ Results file contains job identification and results of individual tasks.
 ### Results items
 Mandatory items are bold, optional italic.
 - **job-id** - identification of job to which this results belongs
+- _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
   - **status** - three states: OK, FAILED, SKIPPED