diff --git a/docs/user_guide/concepts/main_concepts/executions.rst b/docs/user_guide/concepts/main_concepts/executions.rst
index b6ee602520..dd95c25dee 100644
--- a/docs/user_guide/concepts/main_concepts/executions.rst
+++ b/docs/user_guide/concepts/main_concepts/executions.rst
@@ -6,7 +6,7 @@ Executions
 
 .. tags:: Basic, Glossary
 
-**Executions** are instances of workflows, nodes or tasks created in the system as a result of a user-requested execution or a scheduled execution.
+**Executions** are instances of workflows, nodes or tasks created in the system as a result of a user-requested execution or a scheduled execution. Execution IDs are unique within a given project domain, ensuring that no two executions within the same domain can have the same ID.
 
 Typical Flow Using Flytectl
 ---------------------------