architecture.md

@@ -161,6 +161,13 @@ As such, we see NixOS as the only viable way to reliably create a reproducible o
 Considered alternatives include:
 - containers: do not by themselves offer the needed reproducibility
 
+#### [npins](https://github.com/andir/npins)
+
+Npins is a dependency pinning tool for Nix which leaves recursive dependencies explicit, keeping the consumer in control.
+
+Considered alternatives include:
+- Flakes: defaults to implicitly following recursive dependencies, leaving control with the publisher.
+
 ### [OpenTofu](https://opentofu.org/)
 
 OpenTofu is the leading open-source framework for infrastructure-as-code.