diff --git a/notebooks/example_electric_vehicle_standalone.ipynb b/notebooks/example_electric_vehicle_standalone.ipynb
index f8cc097..7dba4fc 100644
--- a/notebooks/example_electric_vehicle_standalone.ipynb
+++ b/notebooks/example_electric_vehicle_standalone.ipynb
@@ -92,7 +92,7 @@
     "biosphere = bd.Database(\"biosphere\")\n",
     "biosphere.write(\n",
     "    {\n",
-    "        (\"biosphere\", \"CO2\"): {  # only biosphere flow is CH4\n",
+    "        (\"biosphere\", \"CO2\"): {\n",
     "            \"type\": \"emission\",\n",
     "            \"name\": \"carbon dioxide\",\n",
     "        },\n",