diff --git a/notebooks/problem0039.ipynb b/notebooks/problem0039.ipynb
index 1768c9c..886c0bc 100644
--- a/notebooks/problem0039.ipynb
+++ b/notebooks/problem0039.ipynb
@@ -103,7 +103,7 @@
    "id": "f32fb164",
    "metadata": {},
    "source": [
-    "There are eight triangles with this perimeter."
+    "There are eight right triangles with this perimeter."
    ]
   },
   {