diff --git a/Checkpoints/Checkpoint2.ipynb b/Checkpoints/Checkpoint2.ipynb
index 25eadb8cbf1599d2ae600110a14838ae5d816051..20a070e97b22b55832cbad763eba779e241934a4 100644
--- a/Checkpoints/Checkpoint2.ipynb
+++ b/Checkpoints/Checkpoint2.ipynb
@@ -50,7 +50,9 @@
     "    - a=2.0, b=4.0 and c=2.0\n",
     "    - a=0.0, b=6.0 and c=8.0\n",
     "\n",
-    "Ensure you get sensible answers for the four cases. Remember when a=0.0 you will get a linear equation with a single root. You should handle this correctly.\n",
+    "Ensure you get sensible answers for the four cases. **Remember when a=0.0 you will get a linear equation with a single root. You should handle this correctly.**\n",
+    "> #### Note:\n",
+    "> You should think about using the `cmath.sqrt` and `math.sqrt` functions to deal explicitly with square roots of complex and real numbers respectively.\n",
     "\n",
     "- Call a demonstrator, show them your code and run your program with the four sets of inputs above and any additional ones requested by the demonstrator.\n",
     "- Ensure that the demonstrator finds you in Learn. Please check that your pass/fail (0/1) has been entered correctly (you should be able to see this in Learn). \n",