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skills/nix-packaging/rust/rust.md

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+# Packaging Rust Applications with Nix
+
+See [codex](./codex/package.nix) for an example.
+
+## Updating an Existing Rust Package
+
+Besides the general update steps, also update the `cargoHash`:
+
+```bash
+# Set cargoHash = ""; then run nix build
+# Nix will fail and show: "got: sha256-XXXXX"
+```
+
+If `Cargo.toml` dependencies changed, the build will automatically fetch new dependencies after you update the `cargoHash`.