diff --git a/docs/forecast_varying.ipynb b/docs/forecast_varying.ipynb
index 50f1336..e2892ba 100644
--- a/docs/forecast_varying.ipynb
+++ b/docs/forecast_varying.ipynb
@@ -81,7 +81,9 @@
     "pressure_v_time[n_times // 4 : n_times // 2] /= 2.0\n",
     "pressure_v_time[n_times // 2 :] /= 4.0\n",
     "\n",
-    "pvt_gas = pd.read_csv(\"https://raw.githubusercontent.com/frank1010111/bluebonnet/main/tests/data/pvt_gas.csv\").rename(\n",
+    "pvt_gas = pd.read_csv(\n",
+    "    \"https://raw.githubusercontent.com/frank1010111/bluebonnet/main/tests/data/pvt_gas.csv\"\n",
+    ").rename(\n",
     "    columns={\n",
     "        \"P\": \"pressure\",\n",
     "        \"Z-Factor\": \"z-factor\",\n",