diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 94ce0d2..242b3a0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1164,6 +1164,9 @@
 
 	nomce		[IA-32] Machine Check Exception
 
+	noreplace-smp	[IA-32,SMP] Don't replace SMP instructions
+			with UP alternatives
+
 	noresidual	[PPC] Don't use residual data on PReP machines.
 
 	noresume	[SWSUSP] Disables resume and restores original swap
@@ -1569,6 +1572,9 @@
 	smart2=		[HW]
 			Format: <io1>[,<io2>[,...,<io8>]]
 
+	smp-alt-once	[IA-32,SMP] On a hotplug CPU system, only
+			attempt to substitute SMP alternatives once at boot.
+
 	snd-ad1816a=	[HW,ALSA]
 
 	snd-ad1848=	[HW,ALSA]