diff --git a/README.md b/README.md
index e13331f..56e24e3 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ Create a file `.digitalocean-dynamic-ip.json` (dot prefix to hide the file) and
 
 ```json
 {
+  "interval": "30m",
   "apikey": "samplekeydasjkdhaskjdhrwofihsamplekey",
   "doPageSize": 20,
   "useIPv4": true,
@@ -90,13 +91,3 @@ By default the tool will not output anything on success. If you wish to see debu
 #run:
 ./digitalocean-dynamic-ip -debug /path/to/my/config.json
 ```
-
-You can either set this to run periodically with a cronjob or use your own method.
-
-```bash
-# run `crontab -e` to edit your crontab
-# sample cron job task
-
-# m h  dom mon dow   command
-*/5 * * * * /home/user/digitalocean-dynamic-dns-ip/digitalocean-dynamic-ip
-```
diff --git a/digitalocean-dynamic-ip.go b/digitalocean-dynamic-ip.go
index 987d1df..c2372ec 100644
--- a/digitalocean-dynamic-ip.go
+++ b/digitalocean-dynamic-ip.go
@@ -12,7 +12,10 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"os/signal"
 	"strconv"
+	"syscall"
+	"time"
 )
 
 func checkError(err error) {
@@ -48,6 +51,7 @@ var config ClientConfig
 
 // ClientConfig : configuration json
 type ClientConfig struct {
+	Interval        string   `json:"interval"`
 	APIKey          string   `json:"apiKey"`
 	DOPageSize      int      `json:"doPageSize"`
 	UseIPv4         *bool    `json:"useIPv4"`
@@ -366,8 +370,9 @@ func toIPv6String(ip net.IP) (currentIP string) {
 // 	return true
 // }
 
-func main() {
-	config = GetConfig()
+// updateAllDomains retrieves the current IP addresses and loops through all
+// domains in the config to update them with the current IPs.
+func updateAllDomains(config ClientConfig) {
 	currentIPv4, currentIPv6 := CheckLocalIPs()
 	if currentIPv4 == nil && currentIPv6 == nil {
 		logError("Current IP addresses are not valid, or both are disabled in the config. Check your configuration and internet connection.")
@@ -379,3 +384,30 @@ func main() {
 		log.Printf("%s: END", domain.Domain)
 	}
 }
+
+func main() {
+	config = GetConfig()
+
+	interval, err := time.ParseDuration(config.Interval)
+	checkError(err)
+
+	ticker := time.NewTicker(interval)
+	cancelChan := make(chan os.Signal)
+	signal.Notify(cancelChan, syscall.SIGTERM, syscall.SIGINT)
+
+	// Run once immediately before waiting for the ticker
+	updateAllDomains(config)
+
+	func() {
+		for {
+			select {
+			case <-cancelChan:
+				return
+			case <-ticker.C:
+				updateAllDomains(config)
+			}
+		}
+	}()
+
+	ticker.Stop()
+}
diff --git a/digitalocean-dynamic-ip.sample.json b/digitalocean-dynamic-ip.sample.json
index df9b471..ede7b88 100644
--- a/digitalocean-dynamic-ip.sample.json
+++ b/digitalocean-dynamic-ip.sample.json
@@ -1,4 +1,5 @@
 {
+  "interval": "30m",
   "apikey": "samplekeydasjkdhaskjdhrwofihsamplekey",
   "doPageSize": 20,
   "useIPv4": true,