diff --git a/koans/about_triangle_project_2.rb b/koans/about_triangle_project_2.rb
index c48c3cb..fc90ba1 100644
--- a/koans/about_triangle_project_2.rb
+++ b/koans/about_triangle_project_2.rb
@@ -11,6 +11,7 @@ class AboutTriangleProject2 < EdgeCase::Koan
     assert_raise(TriangleError) do triangle(3, 4, -5) end
     assert_raise(TriangleError) do triangle(1, 1, 3) end
     assert_raise(TriangleError) do triangle(2, 4, 2) end
+    #HINT: for tips, see http://stackoverflow.com/questions/3834203/ruby-koan-151-raising-exceptions
  end
 end