diff --git a/src/BUILD_UNIX.md b/src/BUILD_UNIX.md
index 7034dd4e..16735f2c 100644
--- a/src/BUILD_UNIX.md
+++ b/src/BUILD_UNIX.md
@@ -33,6 +33,7 @@ You need to install the following software to build SoftEther VPN for UNIX.
 
 ```bash
 sudo yum -y groupinstall "Development Tools"
+sudo yum -y install epel-release
 sudo yum -y install cmake ncurses-devel openssl-devel libsodium-devel readline-devel zlib-devel
 ```