Increase the suggested minimum ram to 4gb
Change-Id: I4f098d731693e635ebcc89357d382674c7730201
diff --git a/doc/source/guides/single-vm.rst b/doc/source/guides/single-vm.rst
index a41c4e1..ab46d91 100644
--- a/doc/source/guides/single-vm.rst
+++ b/doc/source/guides/single-vm.rst
@@ -15,7 +15,7 @@
---------------
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
---------------------------------