diff --git a/README.md b/README.md
index c0ecd17..4e1517c 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ ROM 4X is an enhancement to the Apple //c version 4 firmware ROM.
 
 It adds the following features to the Apple //c version 4 firmware:
 
-  - Identifies and reinstates a *bootable* (it must have a boot block!) ProDOS-formatted RAM disk from battery-backed expansion memory (see below).
+  - Identifies and reinstates a *bootable* (it must have a boot block!) ProDOS-formatted RAM disk from battery-backed expansion memory (see below), such as the [RAM Express II+](http://a2heaven.com/webshop/index.php?rt=product/product&product_id=144) from A2Heaven.
   - Provides a menu of various tools upon pressing Ctrl+Closed-Apple+Reset (or holding Closed-Apple when powering up), that let you:
     - Enter the monitor unconditionally.
     - Reboot the machine (enter standard boot sequence).