diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f8df946..f270f23 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,6 +33,11 @@ repos:
         args: [--line-length=85]
         types_or: [jupyter]
 
+  - repo: https://github.com/ComPWA/repo-maintenance
+    rev: 0.0.199
+    hooks:
+      - id: colab-toc-visible
+
   - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
     rev: 2.7.2
     hooks:
diff --git a/visualize-benchmark.ipynb b/visualize-benchmark.ipynb
index 6253a17..7a2c888 100644
--- a/visualize-benchmark.ipynb
+++ b/visualize-benchmark.ipynb
@@ -81,6 +81,9 @@
   }
  ],
  "metadata": {
+  "colab": {
+   "toc_visible": true
+  },
   "kernelspec": {
    "display_name": "tw",
    "language": "python",
@@ -98,7 +101,6 @@
    "pygments_lexer": "ipython3",
    "version": "3.8.16"
   },
-  "orig_nbformat": 4,
   "vscode": {
    "interpreter": {
     "hash": "941585edea6bc165435aa3186ccdcc04147aa4112b01c30ec33a5464a4b433ae"