diff --git a/examples/btree.cc b/examples/btree.cc
index 44dcc5c..4ff8e23 100644
--- a/examples/btree.cc
+++ b/examples/btree.cc
@@ -15,6 +15,9 @@ int main()
     map["lucy"]  = 18;
     map["Andre"] = 20;
 
+    auto it = map.find("Joe");
+    map.erase(it);
+
     map.insert(std::make_pair("Alex", 16));
     map.emplace("Emily", 18); // emplace uses pair template constructor
     
diff --git a/tests/btree_test.h b/tests/btree_test.h
index 4472916..7f7438f 100644
--- a/tests/btree_test.h
+++ b/tests/btree_test.h
@@ -60,11 +60,11 @@ namespace phmap {
 
 namespace test_internal {
 
-// A type that counts number of occurrences of the type, the live occurrences of
-// the type, as well as the number of copies, moves, swaps, and comparisons that
-// have occurred on the type. This is used as a base class for the copyable,
-// copyable+movable, and movable types below that are used in actual tests. Use
-// InstanceTracker in tests to track the number of instances.
+    // A type that counts number of occurrences of the type, the live occurrences of
+    // the type, as well as the number of copies, moves, swaps, and comparisons that
+    // have occurred on the type. This is used as a base class for the copyable,
+    // copyable+movable, and movable types below that are used in actual tests. Use
+    // InstanceTracker in tests to track the number of instances.
     class BaseCountedInstance {
     public:
         explicit BaseCountedInstance(int x) : value_(x) {