diff --git a/15_hierarchical_modelling.ipynb b/15_hierarchical_modelling.ipynb
index bee2fb8..0ce3772 100644
--- a/15_hierarchical_modelling.ipynb
+++ b/15_hierarchical_modelling.ipynb
@@ -462,7 +462,7 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "`````{admonition} Group Task \n",
+        "`````{admonition} Task 21\n",
         ":class: tip\n",
         "\n",
         "- Draw a diagram showing the hierarchy in the data. What are the “groups” here?\n",
@@ -488,7 +488,7 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "`````{admonition} Task 21\n",
+        "`````{admonition} Task 22\n",
         ":class: tip\n",
         "\n",
         "```{margin}\n",