diff --git a/ProgrammingAssignment_1/ProgrammingAssignment1.ipynb b/ProgrammingAssignment_1/ProgrammingAssignment1.ipynb
index c731ed8fe8368e101057b632a72d41638a19d1de..b04fc632d433d51c1dc117a8c5aa83234e7dd557 100644
--- a/ProgrammingAssignment_1/ProgrammingAssignment1.ipynb
+++ b/ProgrammingAssignment_1/ProgrammingAssignment1.ipynb
@@ -453,7 +453,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Use this cell to write about your understanding of why *k*-NN performed well if it did or why not if it didn't."
+    "Use this cell to write about your understanding of why *k*-NN performed well if it did or why not if it didn't. What properties of the dataset affect the performance of the algorithm?"
    ]
   }
  ],
diff --git a/ProgrammingAssignment_1/ProgrammingAssignment1_solution.ipynb b/ProgrammingAssignment_1/ProgrammingAssignment1_solution.ipynb
index c3535482ded9e01f384f660abad8e0d6d88e74e8..131b33a8ab677ad11246a077048d6fa95c561c9a 100644
--- a/ProgrammingAssignment_1/ProgrammingAssignment1_solution.ipynb
+++ b/ProgrammingAssignment_1/ProgrammingAssignment1_solution.ipynb
@@ -553,7 +553,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Use this cell to write about your understanding of why *k*-NN performed well if it did or why not if it didn't."
+    "Use this cell to write about your understanding of why *k*-NN performed well if it did or why not if it didn't. What properties of the dataset affect the performance of the algorithm?"
    ]
   }
  ],