diff --git a/doc/source/guides/single-vm.rst b/doc/source/guides/single-vm.rst
index a41c4e14f1..ab46d91b83 100644
--- a/doc/source/guides/single-vm.rst
+++ b/doc/source/guides/single-vm.rst
@@ -15,7 +15,7 @@ Virtual Machine
 ---------------
 
 DevStack should run in any virtual machine running a supported Linux
-release. It will perform best with 2Gb or more of RAM.
+release. It will perform best with 4Gb or more of RAM.
 
 OpenStack Deployment & cloud-init
 ---------------------------------