diff --git a/website/source/docs/builders/qemu.html.md.erb b/website/source/docs/builders/qemu.html.md.erb
index 8ecb1e51e..01636d633 100644
--- a/website/source/docs/builders/qemu.html.md.erb
+++ b/website/source/docs/builders/qemu.html.md.erb
@@ -240,7 +240,7 @@ Linux server and have not enabled X11 forwarding (`ssh -X`).
     your system. This defaults to `pc`.
 
 -   `memory` (number) - The amount of memory to use when building the VM
-    in megabytes.
+    in megabytes. This defaults to `512` megabytes.
 
 -   `net_device` (string) - The driver to use for the network interface. Allowed
     values `ne2k_pci`, `i82551`, `i82557b`, `i82559er`, `rtl8139`, `e1000`,