diff --git a/docs/notebooks/colour_functions_example.ipynb b/docs/notebooks/colour_functions_example.ipynb
index 524e1bc..1882c00 100644
--- a/docs/notebooks/colour_functions_example.ipynb
+++ b/docs/notebooks/colour_functions_example.ipynb
@@ -282,7 +282,6 @@
     "\n",
     "# store running colour parameters as a dataframe\n",
     "df_col = pd.DataFrame(col_dict_list)\n",
-    "# df_col = pd.concat([df_obs, df_col], axis=1)\n",
     "df_col = df_col.merge(df_obs, on=x_plot)\n",
     "\n",
     "ax1.set_xlabel(x_plot)\n",