diff --git a/Main.java b/Main.java
index dc2600ccf1a204df584fde4890e14fa71ec103f4..1f9886cc615a0f6d387cef52654e3c60338a46c8 100644
--- a/Main.java
+++ b/Main.java
@@ -72,7 +72,7 @@ public class Main {
                 rsa = new RSA(sc.nextBigInteger(),sc.nextBigInteger(),sc.nextBigInteger());
             }
             case 2->{
-                print.println("输入密钥长度");
+                print.println("输入密钥长度,长度不小于512");
                 rsa = new RSA(sc.nextInt());
             }
         }
@@ -167,6 +167,9 @@ class RSA {
          * @param keySize 密钥大小
          */
         public RSA(int keySize){
+            if(keySize < 512){
+                System.err.println("都说了不要小于512，会报错的,重新启动程序吧");
+            }
             try {
                 KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance("RSA");
                 keyGenerator.initialize(keySize);