diff --git a/README.md b/README.md
index 62e8531..3840a36 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 [从 Kotlin 到 Kotlin Multiplatform](https://git.itouc.cn/ITStudio_OUC/From_Kotlin_to_Kotlin-Multiplatform)
 
-完全掌握：引入 Kotlin，进入 KMP
+完全掌握：引入 Kotlin，第一个 KMP 应用
 
 简单了解：深入 Kotlin
 
diff --git a/shared/src/commonMain/kotlin/cn/itouc/git/diceroller/App.kt b/shared/src/commonMain/kotlin/cn/itouc/git/diceroller/App.kt
index 25f5b1d..b596ffd 100644
--- a/shared/src/commonMain/kotlin/cn/itouc/git/diceroller/App.kt
+++ b/shared/src/commonMain/kotlin/cn/itouc/git/diceroller/App.kt
@@ -25,7 +25,7 @@ import kotlin.random.Random
 fun App() {
     MaterialTheme {
         var showContent by remember { mutableStateOf(false) }
-        val r by remember(showContent) { mutableStateOf(Random.nextInt()) }
+        var randomInt by remember { mutableStateOf(Random.nextInt()) }
 
         Column(
             modifier = Modifier
@@ -34,7 +34,12 @@ fun App() {
                 .fillMaxSize(),
             horizontalAlignment = Alignment.CenterHorizontally,
         ) {
-            Button(onClick = { showContent = !showContent }) {
+            Button(
+                onClick = {
+                    showContent = !showContent
+                    if (showContent) randomInt = Random.nextInt()
+                }
+            ) {
                 Text("Click me!")
             }
             AnimatedVisibility(showContent) {
@@ -43,7 +48,7 @@ fun App() {
                     horizontalAlignment = Alignment.CenterHorizontally,
                 ) {
                     Image(painterResource(Res.drawable.compose_multiplatform), null)
-                    Text("a random int: $r")
+                    Text("a random int: $randomInt")
                 }
             }
         }