diff --git a/slides.ipynb b/slides.ipynb
index cdf7a7f..c80de85 100644
--- a/slides.ipynb
+++ b/slides.ipynb
@@ -337,6 +337,8 @@
     "}\n",
     "```\n",
     "\n",
+    "(TOML 1.0 requires tables (dicts) to be one line. Future TOML versions will allow multi-line tables.)\n",
+    "\n",
     "Alternatively\n",
     "\n",
     "```toml\n",