diff --git a/googletest/samples/sample4.cc b/googletest/samples/sample4.cc
index 2f7c87a..b0ee609 100644
--- a/googletest/samples/sample4.cc
+++ b/googletest/samples/sample4.cc
@@ -38,6 +38,16 @@
   return counter_++;
 }
 
+// Returns the current counter value, and decrements it.
+// counter can not be less than 0, return 0 in this case
+int Counter::Decrement() {
+  if (counter_ == 0) {
+    return counter_;
+  } else  {
+    return counter_--;
+  }
+}
+
 // Prints the current counter value to STDOUT.
 void Counter::Print() const {
   printf("%d", counter_);
diff --git a/googletest/samples/sample4.h b/googletest/samples/sample4.h
index fda5f33..e256f40 100644
--- a/googletest/samples/sample4.h
+++ b/googletest/samples/sample4.h
@@ -43,6 +43,9 @@
   // Returns the current counter value, and increments it.
   int Increment();
 
+  // Returns the current counter value, and decrements it.
+  int Decrement();
+
   // Prints the current counter value to STDOUT.
   void Print() const;
 };
diff --git a/googletest/samples/sample4_unittest.cc b/googletest/samples/sample4_unittest.cc
index 079a70d..d5144c0 100644
--- a/googletest/samples/sample4_unittest.cc
+++ b/googletest/samples/sample4_unittest.cc
@@ -37,12 +37,17 @@
 TEST(Counter, Increment) {
   Counter c;
 
+  // Test that counter 0 returns 0
+  EXPECT_EQ(0, c.Decrement());
+
   // EXPECT_EQ() evaluates its arguments exactly once, so they
   // can have side effects.
 
   EXPECT_EQ(0, c.Increment());
   EXPECT_EQ(1, c.Increment());
   EXPECT_EQ(2, c.Increment());
+
+  EXPECT_EQ(3, c.Decrement());
 }
 
 }  // namespace