diff --git a/is/UB3/ExerciseSheet3.ipynb b/is/UB3/ExerciseSheet3.ipynb
index 9e8a3ca..e58609c 100644
--- a/is/UB3/ExerciseSheet3.ipynb
+++ b/is/UB3/ExerciseSheet3.ipynb
@@ -76,6 +76,15 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "##wtf?\n",
+    "\n",
+    "$\\vec{w}=X^{-1}\\vec{y}$, zumindest wenn ich das ausrechne..."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "#  Linear regression (50 Points)\n",
     "\n",
     "In this exercise you will perform a regression analysis on a toy dataset. You will implement ridge regression and learn how to find a good model through a comparative performance analysis.\n",