be more precise about where store derivation outputs are processed

Co-authored-by: Adam Joseph <[email protected]>

src/nix/nix.md

@@ -130,7 +130,7 @@ These are paths inside the Nix store, or symlinks that resolve to a path in the
 
 Example: `/nix/store/p7gp6lxdg32h4ka1q398wd9r2zkbbz2v-hello-2.10.drv`
 
-By default, if you pass a [store derivation] path to a `nix` subcommand, the command will operate on the [output path]s of the derivation.
+By default, if you pass a [store derivation] path to a `nix` subcommand other than [`show-derivation`](./nix3-show-derivation.md), the command will operate on the [output path]s of the derivation.
 
 [output path]: ../../glossary.md#gloss-output-path