diff --git a/README.md b/README.md
index ace0b0e..b438a59 100644
--- a/README.md
+++ b/README.md
@@ -11,11 +11,14 @@ curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/install.sh" |
 ```SHELL
 sudo systemctl start sim800
 sudo systemctl enable sim800
+sudo systemctl start sim800-healthcheck.timer
+sudo systemctl enable sim800-healthcheck.timer
 ```
 
 - Stop
 ```SHELL
 sudo systemctl stop sim800
+sudo systemctl stop sim800-healthcheck.timer
 ```
 
 - Restart
@@ -27,5 +30,6 @@ sudo systemctl restart sim800
 
 ### Ubuntu
 ```SHELL
-sudo apt install ppp
+sudo apt remove -y inetutils-ping
+sudo apt install -y ppp iputils-ping
 ```