diff --git a/README.md b/README.md
index b0e5674..7b1b82a 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,4 @@ JAX-powered Cosmological Particle-Mesh N-body Solver
 
 The goal of this project is to build the next generation of differentiable PM solvers, using JAX as the backend.
 
+This project is currently in an early design phased. All inputs are welcome on the [design document](https://github.com/DifferentiableUniverseInitiative/JaxPM/blob/main/design.md)