diff --git a/README.md b/README.md
index 29cbd0cc..1d4050f2 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,10 @@
 - [Adafruit_nRF52_Arduino](https://github.com/adafruit/Adafruit_nRF52_Arduino)
 - [Adafruit ArduinoCore-samd](https://github.com/adafruit/ArduinoCore-samd) **TinyUSB** must be selected in menu `Tools->USB Stack`
 
-In addition to CDC that provided by the platform core, this library provide platform-independent MSC, HID
+In addition to CDC that provided by the platform core, this library provide platform-independent for
+
+- Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ...
+- Mass Storage Class (MSC): with multiple LUNs
+- Musical Instrument Digital Interface (MIDI)
 
 More document to write ... 
diff --git a/examples/MassStorage/msc_external_flash/msc_external_flash.ino b/examples/MassStorage/msc_external_flash/msc_external_flash.ino
index e4d9186a..e90239c2 100644
--- a/examples/MassStorage/msc_external_flash/msc_external_flash.ino
+++ b/examples/MassStorage/msc_external_flash/msc_external_flash.ino
@@ -69,6 +69,9 @@ void setup()
   
   usb_msc.begin();
 
+  // Init file system on the flash
+  fatfs.begin(&flash);
+
   Serial.begin(115200);
   while ( !Serial ) delay(10);   // wait for native usb
 
@@ -76,9 +79,6 @@ void setup()
   Serial.print("JEDEC ID: "); Serial.println(flash.getJEDECID(), HEX);
   Serial.print("Flash size: "); Serial.println(flash.size());
 
-  // Init file system on the flash
-  fatfs.begin(&flash);
-
   changed = true; // to print contents initially
 }
 
@@ -86,6 +86,8 @@ void loop()
 {
   if ( changed )
   {
+    changed = false;
+    
     if ( !root.open("/") )
     {
       Serial.println("open root failed");
@@ -114,8 +116,6 @@ void loop()
     root.close();
 
     Serial.println();
-
-    changed = false;
     delay(1000); // refresh every 0.5 second
   }
 }