diff --git a/README.md b/README.md
index cd1ce83..bc85256 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Hafnium is a hypervisor, initially supporting aarch64 (64-bit ARMv8 CPUs).
 
+Further details are available in the [design doc](go/hafnium-dd).
+
 ## Getting the source code
 
 ``` shell