diff --git a/app/src/main/java/com/example/ycfelix/myapplication/MainActivity.java b/app/src/main/java/com/example/ycfelix/myapplication/MainActivity.java
index 8e19acd..a03c1a1 100644
--- a/app/src/main/java/com/example/ycfelix/myapplication/MainActivity.java
+++ b/app/src/main/java/com/example/ycfelix/myapplication/MainActivity.java
@@ -195,7 +195,7 @@ private void startVoiceInput() {
                 RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
         intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
         intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
-               "freeriders wants your voice...");
+               "enter your voice...");
         try {
             startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
         } catch (ActivityNotFoundException a) {
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 84c0160..9984ab2 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -165,7 +165,7 @@
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:text="application by freerider@hackust"
+            android:text="freely modify this program"
             android:layout_gravity="center" />
 
         <EditText
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index b710ff6..4dfd680 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,4 +1,4 @@
 <resources>
-    <string name="app_name">Freerider-emotDetector</string>
+    <string name="app_name">demo app</string>
     <string name="action_settings">Settings</string>
 </resources>
diff --git a/screenshot/demo.png b/screenshot/demo.png
deleted file mode 100644
index cf706b5..0000000
Binary files a/screenshot/demo.png and /dev/null differ
diff --git a/screenshot/demo1.png b/screenshot/demo1.png
new file mode 100644
index 0000000..91e9122
Binary files /dev/null and b/screenshot/demo1.png differ