1 files changed, 7 insertions, 1 deletions

diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 85f51e5a749f..7500aad95f3c 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -149,7 +149,13 @@ NUMA
 
   numa=noacpi   Don't parse the SRAT table for NUMA setup
 
-  numa=fake=X   Fake X nodes and ignore NUMA setup of the actual machine.
+  numa=fake=CMDLINE
+                If a number, fakes CMDLINE nodes and ignores NUMA setup of the
+                actual machine.  Otherwise, system memory is configured
+                depending on the sizes and coefficients listed.  For example:
+                        numa=fake=2*512,1024,4*256
+                gives two 512M nodes, a 1024M node, and four 256M nodes.  The
+                remaining system RAM is allocated to an additional node.
 
   numa=hotadd=percent
                 Only allow hotadd memory to preallocate page structures upto