diff --git a/Math/Finance/FinanceFormulas.php b/Math/Finance/FinanceFormulas.php
index af9092207..c69677a5c 100644
--- a/Math/Finance/FinanceFormulas.php
+++ b/Math/Finance/FinanceFormulas.php
@@ -34,6 +34,8 @@ class FinanceFormulas
     /**
      * Annual Percentage Yield
      *
+     * @latex APY = \left(\frac{1 + r}{n}\right)^{n}-1
+     *
      * @param float $r Stated annual interest rate
      * @param int   $n number of times compounded
      *