diff --git a/README.md b/README.md
index 09cab31..430bad9 100644
--- a/README.md
+++ b/README.md
@@ -182,5 +182,7 @@ In the app:
 - Open the `Update` page and tap `Details` to see the installed version,
   selected update source, APK/Release resolver behavior, install permission
   state, and a `Check update` button.
+- Open the `Update` page and tap `App settings` for Android's full per-app
+  permission/settings screen.
 - Open the `About` page to see the app version, package name, API/protocol
   summary, selected update source, and update policy.
diff --git a/app/src/main/java/com/neatstudio/tmuxandroid/MainActivity.java b/app/src/main/java/com/neatstudio/tmuxandroid/MainActivity.java
index ca2210a..913df9e 100644
--- a/app/src/main/java/com/neatstudio/tmuxandroid/MainActivity.java
+++ b/app/src/main/java/com/neatstudio/tmuxandroid/MainActivity.java
@@ -302,6 +302,7 @@ public final class MainActivity extends Activity {
         content.addView(actionPanel(
                 actionButton("Install permission", view -> openInstallPermissionSettings()),
                 actionButton("Notifications", view -> requestNotificationPermission()),
+                actionButton("App settings", view -> openAppSettings()),
                 actionButton("Details", view -> showPermissionsAndUpdateStatus())
         ));
         scroll.addView(content);
@@ -1225,6 +1226,7 @@ public final class MainActivity extends Activity {
             text.append("Notifications: no runtime permission required.\n");
         }
         text.append("SMS: not requested. This tmux client does not need SMS permission.");
+        text.append("\nOpen App settings for Android's full per-app permission and storage/network controls.");
         return text.toString();
     }
 
@@ -1308,6 +1310,14 @@ public final class MainActivity extends Activity {
         requestPermissions(new String[]{Manifest.permission.POST_NOTIFICATIONS}, 3001);
     }
 
+    private void openAppSettings() {
+        Intent intent = new Intent(
+                Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+                Uri.parse("package:" + getPackageName())
+        );
+        startActivity(intent);
+    }
+
     private void showImagePreview(String path, String basePath) {
         progressBar.setVisibility(View.VISIBLE);
         executor.execute(() -> {
diff --git a/docs/android-client-notes.md b/docs/android-client-notes.md
index 4e2ebe0..32570ce 100644
--- a/docs/android-client-notes.md
+++ b/docs/android-client-notes.md
@@ -89,8 +89,8 @@ Implemented now:
 - one-download-per-version APK cache, SHA-256 verification, and installer
   handoff
 - permission/about surfaces for unknown-app install status, notification status,
-  app version, package name, selected update source, and HTTP/WebSocket
-  API/protocol summary
+  app settings, app version, package name, selected update source, and
+  HTTP/WebSocket API/protocol summary
 
 ## Update And Release Policy