diff --git a/math/cos.c b/math/cos.c
index 51bf1a7..f6c1764 100644
--- a/math/cos.c
+++ b/math/cos.c
@@ -3,14 +3,13 @@
 /*
   Approximates the cosine of x.
 
-  Uses a taylor polynomial (roughly) accurate between 0 and 
-  2*pi to approximate the cosine. Any values of x outside this
-  range are modulo'd to be within this range (you know, 'cos
-  cosine is cyclic).
+  Uses a taylor polynomial accurate between 0 and 2*pi to approximate the 
+  cosine. Any values of x outside this range are modulo'd to be within this 
+  range (you know, 'cos cosine is cyclic).
 
   The taylor poly is centered at pi, with a radius of
   convergence of no less than pi, making it roughly accurate 
-  between 0 and 2 * pi. The polynomial is up to x^10, which I've
+  between 0 and 2 * pi. The polynomial is up to x^16, which I've
   confirmed as being accurate being 0 and 2 * pi.
 */
 double cos(double x) {