diff --git a/README.md b/README.md
index f059eca..50b131c 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,11 @@ though with kind of a large form factor relative to Framework Laptop 13.
 Framework Laptop 16 © 2024 by Framework Computer Inc is licensed under CC BY 4.0.
 To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
 
+## 3D CAD (in the base directory)
+
+External 3D CAD of the system and main modules to enable development of 3D-printed replacement parts,
+skins, cases, and other accessories.  We're excited to see what you do with it!
+
 ## Mainboard
 
 This folder contains 2D drawings and interface schematics to enable Mainboard re-use.