diff --git a/assignment_0_3_correspondences_template/imagefiltering.ipynb b/assignment_0_3_correspondences_template/imagefiltering.ipynb
index 4148f9ba741f3b888a0c9b2e001a67e1adb5144b..4081efe4f8c9b910b723bdbe51702f8134283269 100644
--- a/assignment_0_3_correspondences_template/imagefiltering.ipynb
+++ b/assignment_0_3_correspondences_template/imagefiltering.ipynb
@@ -454,6 +454,13 @@
     "![image.png](imagefiltering_files/att_00007.png)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In function `visualize_A` below, the line shows the X (to the right) direction of the resulting patch."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 12,