diff --git a/math.d b/math.d
index 8bf5cb9..a4b4d12 100644
--- a/math.d
+++ b/math.d
@@ -9,6 +9,14 @@ import std.meta;
 import std.format;
 import std.stdio;
 
+T
+RoundUp(T a, T b)
+{
+	a += b - 1;
+	a -= a%b;
+	return a;
+}
+
 T AlignPow2(T)(T v, T a)
 {
 	return (v + a - 1) & ~(a - 1);