diff --git a/install/install.sh b/install/install.sh
index 04509b9e..e02e7195 100644
--- a/install/install.sh
+++ b/install/install.sh
@@ -141,10 +141,9 @@ install_tools(){
     apt_status=$?
 
     if [ $dnf_status -eq 0 ]; then
-        
-        dnf install $tools_yum -y
+        for package in $tools_yum; do sudo dnf install -y $package > /dev/null; done
     elif [ $yum_status -eq 0 ]; then
-        yum install epel $tools_yum -y
+        for package in $tools_yum; do sudo yum install -y $package > /dev/null; done
     elif [ $apt_status -eq 0 ]; then
         while fuser /var/lib/dpkg/lock >/dev/null 2>&1 ; do
         echo "Waiting for other software managers to finish..."
diff --git a/install/install_docker.sh b/install/install_docker.sh
index 43acaa7d..d3d4f77b 100644
--- a/install/install_docker.sh
+++ b/install/install_docker.sh
@@ -24,7 +24,9 @@ export PATH
 #
 #   $ sudo sh install_docker.sh
 
-docker_packages="docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin"
+
+# it must export, otherwise Rocky Linux cannot used at yum command
+export docker_packages="docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin"
 echo_prefix_docker=$'\n[Docker] - '
 
 docker_exist() {
diff --git a/systemd/README.md b/systemd/README.md
index 3c8b23e4..bef5cdda 100644
--- a/systemd/README.md
+++ b/systemd/README.md
@@ -13,4 +13,10 @@ sudo cp -f "$install_path/systemd/websoft9.service" /lib/systemd/system/
 sudo systemctl daemon-reload
 sudo systemctl enable websoft9.service  
 sudo systemctl start websoft9
-```
\ No newline at end of file
+```
+
+## Develop it
+
+* [systemd.exec — Execution environment configuration](https://www.freedesktop.org/software/systemd/man/systemd.exec.html)
+* [systemd.unit — Unit configuration](https://www.freedesktop.org/software/systemd/man/systemd.unit.html)
+* [systemd.service — Service unit configuration](https://www.freedesktop.org/software/systemd/man/systemd.service.html)
\ No newline at end of file
diff --git a/version.json b/version.json
index fd799b34..1faf7733 100644
--- a/version.json
+++ b/version.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.8.26-rc60",
+  "version": "0.8.26-rc61",
   "plugins": {
     "portainer": "0.0.7",
     "nginx": "0.0.5",