--- a/python/mozbuild/mozbuild/vendor_rust.py
+++ b/python/mozbuild/mozbuild/vendor_rust.py
@@ -259,18 +259,16 @@ license file's hash.
         cargo = self._ensure_cargo()
         if not cargo:
             return
 
         relative_vendor_dir = 'third_party/rust'
         vendor_dir = mozpath.join(self.topsrcdir, relative_vendor_dir)
         self.log(logging.INFO, 'rm_vendor_dir', {}, 'rm -rf %s' % vendor_dir)
         mozfile.remove(vendor_dir)
-        # Once we require a new enough cargo to switch to workspaces, we can
-        # just do this once on the workspace root crate.
 
         # We use check_call instead of mozprocess to ensure errors are displayed.
         # We do an |update -p| here to regenerate the Cargo.lock file with minimal changes. See bug 1324462
         subprocess.check_call([cargo, 'update', '-p', 'gkrust'], cwd=self.topsrcdir)
 
         subprocess.check_call([cargo, 'vendor', '--quiet', '--no-delete', '--sync', 'Cargo.lock'] + [vendor_dir], cwd=self.topsrcdir)
 
         if not self._check_licenses(vendor_dir):