diff --git a/coil_generator.ipynb b/coil_generator.ipynb
index 0643baa..16fc0a2 100644
--- a/coil_generator.ipynb
+++ b/coil_generator.ipynb
@@ -106,6 +106,7 @@
    "outputs": [],
    "source": [
     "# templates must be simetric around the X axis and must include the center points on both size (e.g. (X1, 0).... (X2, 0) )\n",
+    "# template must also be convex\n",
     "template = [\n",
     "    (-0.6, 0),\n",
     "    (-0.6, -0.6),\n",
@@ -168,6 +169,7 @@
     "            point2, point1, point2, spacing, (template_index + 1) // template_length\n",
     "        )\n",
     "        # add an intermediate point which is the intersection of this new line with the previous line (if there is one)\n",
+    "        # this prevents any cutting of corners\n",
     "        if len(coil_points) >= 2:\n",
     "            # create a line from the previous two points\n",
     "            line1 = Line(\n",