diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index db414e97a71..8336a143617 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -612,6 +612,7 @@ def make_delivery_note(source_name, target_doc=None, skip_item_mapping=False):
 
 	if not skip_item_mapping:
 		def condition(doc):
+			# make_mapped_doc sets js `args` into `frappe.flags.args`
 			if frappe.flags.args and frappe.flags.args.delivery_dates:
 				if cstr(doc.delivery_date) not in frappe.flags.args.delivery_dates:
 					return False