diff --git a/docs/notebooks/Case_study_intertidal.ipynb b/docs/notebooks/Case_study_intertidal.ipynb
index db3ebc2..dc0c92e 100644
--- a/docs/notebooks/Case_study_intertidal.ipynb
+++ b/docs/notebooks/Case_study_intertidal.ipynb
@@ -1046,11 +1046,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 19,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option WIDTH\n",
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option HEIGHT\n",
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option COUNT\n",
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option DTYPE\n",
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option CRS\n",
+      "WARNING:rasterio._env:CPLE_NotSupported in driver GTiff does not support creation option TRANSFORM\n"
+     ]
+    }
+   ],
    "source": [
-    "intertidal.astype(int).odc.write_cog(\"intertidal_map.tif\", overwrite=True);"
+    "intertidal.astype(\"int16\").odc.write_cog(\"intertidal_map.tif\", overwrite=True);"
    ]
   }
  ],