diff --git a/Engine-prototype.md b/Engine-prototype.md
index 8a8310e..99bcdf3 100644
--- a/Engine-prototype.md
+++ b/Engine-prototype.md
@@ -56,6 +56,7 @@ Some of these are obvious, but we may as well write them down. Note we may want
 * Since generally speaking, at least for most of the starting list of constraints, each constraint is quadratic, there _might_ be some useful information here
   * [Paper on deciding the existence of solutions](http://arxiv.org/abs/2106.08119)
   * [Relevant Math.StackExchange question](https://math.stackexchange.com/questions/2119007/how-do-you-solve-a-system-of-quadratic-equations)
+* If say we are seeking the closest satisfying point to some input, it might be that we are trying to minimize a nonnegative polynomial, and then some of the information at https://en.wikipedia.org/wiki/Positive_polynomial might be relevant.
 
 Feel free to add in other ideas in any of these categories.