diff --git a/README-CN.md b/README-CN.md
index 82b732c..7d16333 100644
--- a/README-CN.md
+++ b/README-CN.md
@@ -79,7 +79,7 @@ sudo apt-get install -y bc net-tools pciutils
 ```
 如果系统是Redhat/CentOS，在使用此项目前，需要安装如下的软件包：
 ```
-sudo yum install -y bc net-tools pciutils NetworkManager 
+sudo yum install -y bc net-tools pciutils NetworkManager epel-release 
 ```
 
 ### 需要预先进行的配置 
diff --git a/README.md b/README.md
index 780d8b2..d1aacd4 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ sudo apt-get install -y bc net-tools pciutils network-manager
 
 Redhat/CentOS need install packages before use the hardening tool:
 ```
-sudo yum install -y bc net-tools pciutils NetworkManager 
+sudo yum install -y bc net-tools pciutils NetworkManager epel-release 
 ```
 
 ### Pre-Set