diff --git a/shiterator.hpp b/shiterator.hpp
index 07a3e3e..434107d 100644
--- a/shiterator.hpp
+++ b/shiterator.hpp
@@ -125,6 +125,11 @@
  * weird C++ iterators.  Amit did a lot to show me how to do these calculations
  * without branching.  Thanks to you both--and to everyone else--for helping me while I
  * stream my development.
+ *
+ * ### SERIOUS DISCLAIMER
+ *
+ * I am horribly bad at trigonometry and graphics algorithms, so if you've got an idea to improve them
+ * or find a bug shoot me an email at help@learncodethehardway.com.
  */
 namespace shiterator { using std::vector, std::queue, std::array; using
   std::min, std::max, std::floor;