diff --git a/README.md b/README.md
index e608404..e5a53dc 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,19 @@
-# Simple incoming SMS to URL forwarder
-Set sender phone number or name and URL. If you want to send any SMS - use * (asterisk symbol) as a name.
-Every incoming SMS will be sent immediately to provided URL.
-Use it as Webhook for your SMS
+# Incoming SMS to URL forwarder
 
-## Limitations
-The current version will try to send a text to the URL immediately. If no Internet connection, the app will retry once later.
-The app will not check the HTTP response code. If the server responded with any code, it will be treated as sent.
+## How to use
+Set sender phone number or name and URL. It should match the number or name you see in the SMS messenger app. 
+If you want to send any SMS to URL, use * (asterisk symbol) as a name.  
+
+Every incoming SMS will be sent immediately to the provided URL. 
+If the response code is not 2XX or the request ended with a connection error, the app will try to send again up to 10 times.
+Minimum first retry will be after 10 seconds, later wait time will increase exponentially.
+If the phone is not connected to the internet, the app will wait for the connection before the next attempt.
 
 ## Screenshots
-<img alt="Incoming SMS Webhook Gateway screenshot 1" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/1.jpg" width="30%"/> <img alt="Incoming SMS Webhook Gateway screenshot 2" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/2.jpg" width="30%"/> <img alt="Incoming SMS Webhook Gateway screenshot 3" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/3.jpg" width="30%"/>
+<img alt="Incoming SMS Webhook Gateway screenshot 1" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/1.png" width="30%"/> <img alt="Incoming SMS Webhook Gateway screenshot 2" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/2.png" width="30%"/> <img alt="Incoming SMS Webhook Gateway screenshot 3" src="https://raw.githubusercontent.com/bogkonstantin/android_income_sms_gateway_webhook/master/screenshots/3.png" width="30%"/>
 
 ## Download apk
 Download apk from [release page](https://github.com/bogkonstantin/android_income_sms_gateway_webhook/releases)
+
+## Recommendation
+Use external monitoring tools like [UpTime.onl](https://uptime.onl/) to monitor your webhook URL and prevent it from downtime.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index a309600..742a5c9 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     buildToolsVersion "29.0.3"
 
     defaultConfig {
         applicationId "tech.bogomolov.incomingsmsgateway"
         minSdkVersion 19
         targetSdkVersion 30
-        versionCode 5
-        versionName "1.1"
+        versionCode 6
+        versionName "2.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/screenshots/1.jpg b/screenshots/1.jpg
deleted file mode 100644
index 7021d3a..0000000
Binary files a/screenshots/1.jpg and /dev/null differ
diff --git a/screenshots/1.png b/screenshots/1.png
new file mode 100644
index 0000000..017fb35
Binary files /dev/null and b/screenshots/1.png differ
diff --git a/screenshots/2.jpg b/screenshots/2.jpg
deleted file mode 100644
index 7c04cb9..0000000
Binary files a/screenshots/2.jpg and /dev/null differ
diff --git a/screenshots/2.png b/screenshots/2.png
new file mode 100644
index 0000000..1bd088f
Binary files /dev/null and b/screenshots/2.png differ
diff --git a/screenshots/3.jpg b/screenshots/3.jpg
deleted file mode 100644
index d204142..0000000
Binary files a/screenshots/3.jpg and /dev/null differ
diff --git a/screenshots/3.png b/screenshots/3.png
new file mode 100644
index 0000000..7690b92
Binary files /dev/null and b/screenshots/3.png differ