diff --git a/README.md b/README.md
index a41cbc7..e7f1163 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Something about scripts
 Debian series(Debian / Ubuntu / Kali):
 <pre><code>apt update -y</code></pre>
 <pre><code>apt install wget -y</code></pre>
-Redhat series(CentOS / AlmaLinux / RockyLinux / OracleLinux / Fedora / VzLinux / ScientificOS / RedHat Enterprise Linux / Tencent OpenCloudOS / AWS AmazonLinux / AlibabaCloudLinux or AliyunLinux / OpenAnolis):
+RedHat series, only based on RedHat 7+, grub2(CentOS / AlmaLinux / RockyLinux / OracleLinux / Fedora / VzLinux / ScientificOS / RedHat Enterprise Linux / Tencent OpenCloudOS / AWS AmazonLinux / AlibabaCloudLinux or AliyunLinux / OpenAnolis):
 <pre><code>yum install wget -y</code></pre>
 
 ## Quickly start