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diff --git a/chapter2/demo2.cxx b/chapter2/demo2.cxx
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+// FILE: demo2.cxx
+// This small demonstration shows how the revised throttle class is used.
+#include <iostream>     // Provides cout and cin
+#include <cstdlib>      // Provides EXIT_SUCCESS
+#include "throttle.h"   // Provides the throttle class
+using namespace std;    // Allows all Standard Library items to be used
+using main_savitch_2A::throttle;
+
+const int DEMO_SIZE = 5;  // Number of positions in a demonstration throttle
+
+int main( )
+{
+    throttle sample(DEMO_SIZE);  // A throttle to use for our demonstration
+    int user_input;              // The position that we set the throttle to
+    
+    // Set the sample throttle to a position indicated by the user.
+    cout << "I have a throttle with " << DEMO_SIZE << " positions." << endl;
+    cout << "Where would you like to set the throttle?" << endl;
+    cout << "Please type a number from 0 to " << DEMO_SIZE << ": ";
+    cin >> user_input;
+    sample.shift(user_input);
+
+    // Shift the throttle down to zero, printing the flow along the way.
+    while (sample.is_on( ))
+    {
+        cout << "The flow is now " << sample.flow( ) << endl;
+        sample.shift(-1);
+    }
+    cout << "The flow is now off" << endl;
+    return EXIT_SUCCESS;
+}