diff --git a/Documentation/wmi/acpi-interface.rst b/Documentation/wmi/acpi-interface.rst
index d31af0ed9c08..06fb7fcf4413 100644
--- a/Documentation/wmi/acpi-interface.rst
+++ b/Documentation/wmi/acpi-interface.rst
@@ -93,4 +93,7 @@ _WED ACPI method
 ----------------
 
 Used to retrieve additional WMI event data, its single parameter is a integer
-holding the notification ID of the event.
+holding the notification ID of the event. This method should be evaluated every
+time an ACPI notification is received, since some ACPI implementations use a
+queue to store WMI event data items. This queue will overflow after a couple
+of WMI events are received without retrieving the associated WMI event data.