diff --git a/app/build.gradle b/app/build.gradle
index 8343374..3565626 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,5 +1,9 @@
 apply plugin: 'com.android.application'
 
+//compileSdkVersion 27 : android8.0(Oreo)
+//minSdkVersion 16 : android4.1(JellyBean)
+//targetSdkVersion 22 : Android5.1(Lollipop)
+
 android {
     compileSdkVersion 27
     defaultConfig {