diff --git a/stdlib/math.krak b/stdlib/math.krak
index 1f4c260..b91456e 100644
--- a/stdlib/math.krak
+++ b/stdlib/math.krak
@@ -107,8 +107,7 @@ fun mod(x: double, y: double): double
    return ans;
 }
 
-
-
+val M_PI = acos(-1);