1 files changed, 5 insertions, 4 deletions
diff --git a/examples/cpp/route_guide/route_guide_server.cc b/examples/cpp/route_guide/route_guide_server.cc
index b071e355bf..5867c16712 100644
--- a/examples/cpp/route_guide/route_guide_server.cc
+++ b/examples/cpp/route_guide/route_guide_server.cc
@@ -24,10 +24,10 @@
 #include <string>
 
 #include <grpc/grpc.h>
-#include <grpc++/server.h>
-#include <grpc++/server_builder.h>
-#include <grpc++/server_context.h>
-#include <grpc++/security/server_credentials.h>
+#include <grpcpp/server.h>
+#include <grpcpp/server_builder.h>
+#include <grpcpp/server_context.h>
+#include <grpcpp/security/server_credentials.h>
 #include "helper.h"
 #include "route_guide.grpc.pb.h"
 
@@ -51,6 +51,7 @@ float ConvertToRadians(float num) {
   return num * 3.1415926 /180;
 }
 
+// The formula is based on http://mathforum.org/library/drmath/view/51879.html
 float GetDistance(const Point& start, const Point& end) {
   const float kCoordFactor = 10000000.0;
   float lat_1 = start.latitude() / kCoordFactor;