diff --git a/datafusion/expr/src/logical_plan/plan.rs b/datafusion/expr/src/logical_plan/plan.rs
index d68e6cd81272..01dcc3a74394 100644
--- a/datafusion/expr/src/logical_plan/plan.rs
+++ b/datafusion/expr/src/logical_plan/plan.rs
@@ -2040,7 +2040,9 @@ impl ToStringifiedPlan for LogicalPlan {
     }
 }
 
-/// Produces no rows: An empty relation with an empty schema
+/// Relationship produces 0 or 1 placeholder rows with specified output schema
+/// In most cases the output schema for `EmptyRelation` would be empty,
+/// however, it can be non-empty typically for optimizer rules
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct EmptyRelation {
     /// Whether to produce a placeholder row