diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index dc663c0ca6706..b1350b66cc4fa 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4673,7 +4673,7 @@
 				  '1' – force enabled
 				  'x' – unchanged
 				For example,
-				  pci=config_acs=10x
+				  pci=config_acs=10x@pci:0:0
 				would configure all devices that support
 				ACS to enable P2P Request Redirect, disable
 				Translation Blocking, and leave Source