diff --git a/README.md b/README.md
index 5a7d2d7..0fe02b2 100644
--- a/README.md
+++ b/README.md
@@ -14,15 +14,20 @@ This library makes it easy to implement a [Backdrop](https://material.io/design/
 
 
 ## Download
-
 **JCenter (Recommended):**
+
+*For support library:*
 ```groovy
 dependencies {
     implementation 'ru.semper-viventem.backdrop:backdrop:0.1.2'
 }
 ```
-*or*
-
+*For Android X:*
+```groovy
+dependencies {
+    implementation 'ru.semper-viventem.backdrop:backdrop:0.1.2_x'
+}
+```
 **JitPack:**
 ```groovy
 repositories {
@@ -88,7 +93,8 @@ fun <T : CoordinatorLayout.Behavior<*>> View.findBehavior(): T = layoutParams.ru
 
 ```kotlin
 ...
-val backdropBehavior = foregroundContainer.findBehavior() // find behavior
+
+val backdropBehavior: BackdropBehavior = foregroundContainer.findBehavior() // find behavior
 
 with(backdropBehavior) {
         attacheBackContainer(R.id.backContainer) // set back container
@@ -100,9 +106,10 @@ with(backdropBehavior) {
         
         // add listener
         addOnDropListener(object : BackdropBehavior.OnDropListener {
-            // TODO: do anyging
-        }
-    })
+            override fun onDrop(dropState: BackdropBehavior.DropState, fromUser: Boolean) {
+                // TODO: handle listener            
+            }
+        })
 }
 
 ...
diff --git a/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/common/Screen.kt b/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/common/Screen.kt
index 5f7b67f..b201c92 100644
--- a/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/common/Screen.kt
+++ b/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/common/Screen.kt
@@ -1,6 +1,5 @@
 package ru.semper_viventem.backdropview.ui.common
 
-import android.content.Context
 import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.view.LayoutInflater
@@ -22,10 +21,10 @@ abstract class Screen : Fragment {
         return inflater.inflate(layoutId, container, false)
     }
 
-    override fun onStart() {
-        super.onStart()
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
 
-        onInitView(view!!)
+        onInitView(view)
     }
 
     abstract fun onInitView(view: View)
diff --git a/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/text/TextScreen.kt b/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/text/TextScreen.kt
index 0f5863b..3dc9bcc 100644
--- a/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/text/TextScreen.kt
+++ b/sample/src/main/kotlin/ru/semper_viventem/backdropview/ui/text/TextScreen.kt
@@ -13,6 +13,6 @@ class TextScreen : Screen() {
 
     override fun onInitView(view: View) {
 
-        view.image.load("http://mariakucherenko.com/wp-content/uploads/2011/08/20110814_%D0%BA%D0%BE%D1%82.jpg")
+        view.image.load("https://habrastorage.org/webt/r9/p8/fi/r9p8figkbszo_cyhdg-6nad4mp0.png")
     }
 }
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