diff --git a/advanced/calculated-attributes/operators/or.md b/advanced/calculated-attributes/operators/or.md
index 057bb53ce..3ac915cd4 100644
--- a/advanced/calculated-attributes/operators/or.md
+++ b/advanced/calculated-attributes/operators/or.md
@@ -32,3 +32,7 @@ OUTPUT:
 > [!NOTE]
 > 
 > The repository of the attribute is *Crm.Sales.SalesOrderLines*
+
+> [!NOTE]
+OR is not supported by SELECT but used by the FILTER operator.
+More information: https://docs.erp.net/tech/advanced/calculated-attributes/operators/select.html