diff --git a/hwb1/src/hwb1/MyApplet.java b/hwb1/src/hwb1/MyApplet.java
index 0049ced..8684bda 100644
--- a/hwb1/src/hwb1/MyApplet.java
+++ b/hwb1/src/hwb1/MyApplet.java
@@ -81,7 +81,7 @@ public class MyApplet extends Applet {
                     length = apdu.setIncomingAndReceive();
 
                     if (length > 20) {
-                        // ToDo: Handle too much data.
+                        ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
                     } else {
                         Util.arrayCopy(buffer, ISO7816.OFFSET_CDATA, storage, (short) 0, length);
                     }