diff --git a/app/src/main/java/icu/nullptr/hidemyapplist/ui/fragment/AppSettingsFragment.kt b/app/src/main/java/icu/nullptr/hidemyapplist/ui/fragment/AppSettingsFragment.kt
index 1dc1cfa..32f348b 100644
--- a/app/src/main/java/icu/nullptr/hidemyapplist/ui/fragment/AppSettingsFragment.kt
+++ b/app/src/main/java/icu/nullptr/hidemyapplist/ui/fragment/AppSettingsFragment.kt
@@ -5,6 +5,7 @@ import android.os.Build
 import android.os.Bundle
 import android.view.View
 import android.view.WindowInsets
+import android.widget.Toast
 import androidx.activity.addCallback
 import androidx.core.graphics.drawable.toDrawable
 import androidx.fragment.app.Fragment
@@ -155,6 +156,8 @@ class AppSettingsFragment : Fragment(R.layout.fragment_settings) {
                 it.summary = PackageHelper.loadPackageInfo(pack.app).packageName
             }
             findPreference<SwitchPreferenceCompat>("hideInstallationSource")?.setOnPreferenceChangeListener { _, newValue ->
+                Toast.makeText(requireContext(),
+                    R.string.app_force_stop_warning, Toast.LENGTH_LONG).show()
                 true
             }
             findPreference<SwitchPreferenceCompat>("useWhiteList")?.setOnPreferenceChangeListener { _, newValue ->
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a250e02..74789f4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -94,6 +94,7 @@
     <string name="app_warning_risky_package_title">Risky package</string>
     <string name="app_warning_risky_package_desc">This package is marked as risky and you can cause issues on hidden apps. Do you want to continue?</string>
     <string name="app_hide_installation_source">Spoof installation sources to Play Store</string>
+    <string name="app_force_stop_warning">Don\'t forget to force stop the target app after saving the configuration</string>
 
     <!-- Preset names -->
     <string name="preset_xposed">LSPosed/Xposed modules</string>