diff --git a/src/greet.ts b/src/greet.ts
index 08c455b..81a51a8 100755
--- a/src/greet.ts
+++ b/src/greet.ts
@@ -1,3 +1,6 @@
 export function greet(name: string): string {
-  return `Hi, ${name}!`;
+  if (!name || name.trim().length === 0) {
+    throw new Error("Name cannot be empty");
+  }
+  return `Hello, ${name}!`;
 }