diff --git a/nix/rust.nix b/nix/rust.nix
index 99ab07a5..0ea9a604 100644
--- a/nix/rust.nix
+++ b/nix/rust.nix
@@ -40,11 +40,11 @@ rec {
     fileset = craneLib.fileset.commonCargoSources ../.;
   };
 
-  # Build the workspace's dependency tree once, cached as its own
-  # derivation. Package builds and checks reuse this via
-  # `inherit cargoArtifacts;` so a workspace-only edit doesn't rebuild
-  # deps. All consumers use the same `cleanSrc` so the input hash
-  # stays consistent across the chain.
+  # The workspace's dependency tree, built once and cached as its own
+  # derivation so a workspace-only edit doesn't rebuild deps. Every
+  # consumer passes the same `cleanSrc`, keeping the input hash
+  # consistent across the chain.
+  #
   # Two dep caches, one per audience, and the split is not premature:
   # crane's `buildDepsOnly` defaults `doCheck = true`, which adds
   # `--all-targets` to the check and a `cargo test --no-run`, so the cache