diff --git a/lib/modules.nix b/lib/modules.nix
index e369d98a6426..207b9f3cc6b4 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -589,7 +589,8 @@ let
     in
     modulesPath: initialModules: args: {
       modules = filterModules modulesPath (collectStructuredModules unknownModule "" initialModules args);
-      # Intentionally not shared with `modules` above: this allows `collected`
+      # Intentionally not shared with `modules` above: this allows
+      # the return value of `collectStructuredModules`
       # to be garbage collected after `filterModules` returns.
       graph = toGraph modulesPath (collectStructuredModules unknownModule "" initialModules args);
     };