1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 880f882160e2..9e6056058425 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -794,6 +794,14 @@ and is between 256 and 4096 characters. It is defined in the file
                         for translation below 32 bit and if not available
                         then look in the higher range.
 
+        io_delay=       [X86-32,X86-64] I/O delay method
+                standard
+                        Standard port 0x80 delay
+                alternate
+                        Alternate port 0xed delay
+                udelay
+                        Simple two microsecond delay
+
         io7=            [HW] IO7 for Marvel based alpha systems
                         See comment before marvel_specify_io7 in
                         arch/alpha/kernel/core_marvel.c.