diff --git a/module2/exo4/exercice.ipynb b/module2/exo4/exercice.ipynb
index 0efda349640aa8d12f6a2910aa22fbec0f406072..f2ca9f2f13efbc8384ea48a4611d80b1bff51cce 100644
--- a/module2/exo4/exercice.ipynb
+++ b/module2/exo4/exercice.ipynb
@@ -27,7 +27,7 @@
     "hidePrompt": false
    },
    "source": [
-    "# Unsolved problems \n",
+    "# Encountered problems \n",
     "\n",
     "## Exercise 3.2: had a weird error message when trying to execute the evaluation part:\n",
     "\n",
@@ -47,6 +47,13 @@
     "worked on it together with Eva Diaz, trying to figure out what the problem was, but couldn't find any solution... "
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "With help of Eva understood that assertion error came from uncompleted year and the marked code line that said \"assert ...\", so deleted this line and worked through the rest of the code --> worked! Found strongest year 2009 and weakest year 2020."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,