diff --git a/data/data-pipeline/data_pipeline/ipython/urban_vs_rural.ipynb b/data/data-pipeline/data_pipeline/ipython/urban_vs_rural.ipynb
index 0785a189..1059229a 100644
--- a/data/data-pipeline/data_pipeline/ipython/urban_vs_rural.ipynb
+++ b/data/data-pipeline/data_pipeline/ipython/urban_vs_rural.ipynb
@@ -100,6 +100,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "# CSV was manually generated\n",
+    "# Instructions for how to generate the CSV from Geocorr are here: https://github.com/usds/justice40-tool/issues/355#issuecomment-920241787\n",
     "geocorr_urban_rural_map = pd.read_csv(\n",
     "    os.path.join(GEOCORR_DATA_DIR, \"geocorr2014_2125804280.csv\"),\n",
     "    encoding=\"ISO-8859-1\",\n",