diff --git a/website/source/docs/builders/qemu.html.md.erb b/website/source/docs/builders/qemu.html.md.erb
index 01636d633..ee67068e5 100644
--- a/website/source/docs/builders/qemu.html.md.erb
+++ b/website/source/docs/builders/qemu.html.md.erb
@@ -136,6 +136,7 @@ Linux server and have not enabled X11 forwarding (`ssh -X`).
     specified, the default is `10s` or 10 seconds.
 
 -   `cpus` (number) - The number of cpus to use when building the VM.
+     The default is `1` CPU.
 
 -   `disk_cache` (string) - The cache mode to use for disk. Allowed values
     include any of `writethrough`, `writeback`, `none`, `unsafe`