diff --git a/README.md b/README.md
index 39ef33e..5aceaf5 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,16 @@
 
 ## macos
 
+install nix:
+
+```
+sh <(curl --proto '=https' --tlsv1.2 -L https://nixos.org/nix/install)
+```
+
+> [!TIP]
+> For updates, if nix complains about build groups, see:
+> https://github.com/NixOS/nix/issues/10892
+
 add your user as a trusted-user:
 
 /etc/nix/nix.conf