diff --git a/cf-ddns/README.md b/cf-ddns/README.md
index 21b08c6..fc0746a 100644
--- a/cf-ddns/README.md
+++ b/cf-ddns/README.md
@@ -2,3 +2,13 @@
 
 ## Requirements
 `bash curl jq screen`
+
+## run 1 time 
+`bash cfddns.sh`
+
+## Run in screen 
+`bash run-cfddns.sh`
+
+## Run at boot
+- Add to crontab `crontab -e`
+`@reboot /bin/bash /root/ddns/run-ddns.sh`