diff --git a/notebooks/problem0039.ipynb b/notebooks/problem0039.ipynb
index 1028a90..07d983e 100644
--- a/notebooks/problem0039.ipynb
+++ b/notebooks/problem0039.ipynb
@@ -7,7 +7,7 @@
    "source": [
     "# [Integer Right Triangles](https://projecteuler.net/problem=39)\n",
     "\n",
-    "If a right triangle has integer side lengths, the side lengths are a [Pythagorean triple](https://en.wikipedia.org/wiki/Pythagorean_triple). In [problem 9](https://projecteuler.net/problem=9), we wrote a generator for primitive Pythagorean triples based off of Euclid's formula. We can modify that generator to cut off after the triplets have passed a maximum perimeter. Note that the perimeter of a triangle with side lengths generated by Euclid's formula will have perimeter $2m^2 + 2mn$."
+    "If a right triangle has integer side lengths, the side lengths are a [Pythagorean triple](https://en.wikipedia.org/wiki/Pythagorean_triple). In [problem 9](https://projecteuler.net/problem=9), we wrote a generator for primitive Pythagorean triples based off of Euclid's formula. We can modify that generator to cut off after the triplets have passed a maximum perimeter. Note that a triangle with side lengths generated by Euclid's formula will have perimeter $2m^2 + 2mn$."
    ]
   },
   {