diff --git a/src/math.ts b/src/math.ts
index 8d9b8a2..03f13db 100755
--- a/src/math.ts
+++ b/src/math.ts
@@ -1,3 +1,6 @@
 export function add(a: number, b: number): number {
+  if (!Number.isFinite(a) || !Number.isFinite(b)) {
+    throw new Error("Arguments must be finite numbers");
+  }
   return a + b;
 }