1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 654ea4fccff8..153740f460a6 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -47,6 +47,11 @@ APICs
    noapicmaintimer  Don't do time keeping using the APIC timer.
                  Useful when this option was auto selected, but doesn't work.
 
+   apicpmtimer
+                 Do APIC timer calibration using the pmtimer. Implies
+                 apicmaintimer. Useful when your PIT timer is totally
+                 broken.
+
 Early Console
 
    syntax: earlyprintk=vga