diff --git a/README.md b/README.md
index 02737ec3e..66fa9b4ee 100644
--- a/README.md
+++ b/README.md
@@ -205,6 +205,8 @@ def add_zero(x):
 - Paper: [BendRT: A Parallel Runtime for CPUs and GPUs](paper/BendRT.pdf).
 - Formalization: [bendtt.lean](bend2/bendtt.lean), the kernel of `--verdict` and its proofs, in Lean.
 - Benches: [bench/](bench), every bench used to make the charts above.
+- Module smoke checks: `bend aggregation.bend --checkup` checks and runs
+  each aliased import independently, including lines with trailing `#` comments.
 - Formatter: [bend-fmt-lsp](tools/bend-fmt-lsp), a formatting-only Bend 2 language server.
 - Community language server: [bend2-lsp](https://github.com/don2e4/bend2-lsp), with formatting, diagnostics, and hover.
 - Community workshop: [Bend 2 pocket workshop](https://np.github.io/bend-workshop/), the checker and JS compiler in one HTML page, with goals and proof tools, phone first.
diff --git a/bend2/main.ts b/bend2/main.ts
index f26292508..f8bd19127 100755
--- a/bend2/main.ts
+++ b/bend2/main.ts
@@ -331,7 +331,7 @@ async function cli_checkup(file: string): Promise<void> {
   const base = await book_read(BASE);
   let bad = false;
   for (const raw of fs.readFileSync(file, "utf8").split("\n")) {
-    const m = /^import\s+(\S+)\s+as\s+[A-Za-z_][A-Za-z0-9_]*\s*$/
+    const m = /^import\s+(\S+)\s+as\s+[A-Za-z_][A-Za-z0-9_]*\s*(?:#.*)?$/
       .exec(raw.trim());
     if (m === null) {
       continue;
diff --git a/gates/ping.ts b/gates/ping.ts
index a72189e0a..20378bf39 100644
--- a/gates/ping.ts
+++ b/gates/ping.ts
@@ -325,6 +325,13 @@ try {
     const got = await bend_closed(args);
     check("a closed reader keeps success: " + args.join(" "), got.code === 0);
   }
+  fs.writeFileSync(checkup, "import ./bad.bend as Bad # must still fail\n");
+  fs.writeFileSync(good_checkup, "import ./sum.bend as Good # must still run\n");
+  const comment_bad = await bend([checkup, "--checkup"]);
+  const comment_good = await bend([good_checkup, "--checkup"]);
+  check("import comments preserve checkup rejection and execution",
+    comment_bad.code === 1 && comment_good.code === 0
+    && comment_good.out.endsWith("5n\n"));
   const two  = "import Base\ndef two() -> Nat:\n  2n\n";
   const use  = (at: string) => "import Base\nimport ./" + at
     + " as T\ndef main() -> Nat:\n  T.two\n";