diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 31c094f..1cffa3f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1662,7 +1662,10 @@
 			Only load intel_pstate on systems which support
 			hardware P state control (HWP) if available.
 		support_acpi_ppc
-			Enforce ACPI _PPC performance limits.
+			Enforce ACPI _PPC performance limits. If the Fixed ACPI
+			Description Table, specifies preferred power management
+			profile as "Enterprise Server" or "Performance Server",
+			then this feature is turned on by default.
 
 	intremap=	[X86-64, Intel-IOMMU]
 			on	enable Interrupt Remapping (default)