diff --git a/DepositSlot.java b/DepositSlot.java
new file mode 100644
index 0000000..d6d7ec2
--- /dev/null
+++ b/DepositSlot.java
@@ -0,0 +1,9 @@
+public class DepositSlot
+{
+    // indicates whether envelope was received (always returns true,
+    // because this is only a software simulation of a real deposit slot)
+    public boolean isEnvelopeReceived()
+    {
+        return true; // deposit envelope was received
+    } // end method isEnvelopeReceived
+} 
\ No newline at end of file