diff --git a/README.md b/README.md
index 6efa25d9..da8d9a4c 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ Notes:
 - This is developed with Nixpkgs 20.09, and the ``nixbld.m-labs.hk`` binary substituter can also be used here (see the ARTIQ manual for the public key and instructions).
 - The impure build process is also compatible with non-Nix systems.
 - If the board is connected to the local machine, use the ``local_run.sh`` script.
+- To update ``zynq-rs``, update the cargo files as per usual for Rust projects, but also keep ``zynq-rs.nix`` in sync.
 
 License
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