diff --git a/es/blatt3/uebung3-4/uebung3-4.ino b/es/blatt3/uebung3-4/uebung3-4.ino
index eafdb54..88325eb 100644
--- a/es/blatt3/uebung3-4/uebung3-4.ino
+++ b/es/blatt3/uebung3-4/uebung3-4.ino
@@ -88,25 +88,27 @@ void setup() {
  */
 void loop() {
     if (Serial.available() > 0) {
-      char command[8];
-      char currentChar;
-      int i = 0;
-      bool readable = true;
-      while (readable) {
-        currentChar = Serial.read();
-        readable = (currentChar != -1);
-        command[i] = currentChar;
-        i++;
-      }
-      command[i] = '\0';
-      
-      if (strcmp(command, "LED_on") == 0) {
-        digitalWrite(ledPin, HIGH);
-      }
-      else {
-        digitalWrite(ledPin, LOW);
-      }
-      Serial.println(command);
+        char command[8];
+        char currentChar;
+        int i = 0;
+        bool readable = true;
+        while (readable) {
+            currentChar = Serial.read();
+            readable = (currentChar != -1);
+            if (readable) {
+                command[i] = currentChar;
+                i++;
+            }
+        }
+        command[i] = '\0';
+
+        if (strcmp(command, "LED_on") == 0) {
+            digitalWrite(ledPin, HIGH);
+        }
+        else {
+            digitalWrite(ledPin, LOW);
+        }
+        Serial.println(command);
     }
 }