diff --git a/example/Grid/3_gray_scott_3d_vectorization/Makefile b/example/Grid/3_gray_scott_3d_vectorization/Makefile
index 73b29934dc6d916dd375c3aaa4d724ece064ee8c..873ad49ed886d9e6b0113cb5b8a1d4d2b1e98f3e 100644
--- a/example/Grid/3_gray_scott_3d_vectorization/Makefile
+++ b/example/Grid/3_gray_scott_3d_vectorization/Makefile
@@ -10,10 +10,10 @@ OBJ = main.o update_new.o
 	mpif90 -ffree-line-length-none -fno-range-check -fno-second-underscore  -fimplicit-none  -mavx -O3 -c -g -o $@ $<
 
 %.o: %.cpp
-	$(CC) -O3 -mavx  -g -c --std=c++11 -Wno-ignored-attributes  -o  $@ $< $(INCLUDE_PATH) -I/home/i-bird/VCDEVEL/include
+	$(CC) -O3 -mavx  -g -c --std=c++11 -Wno-ignored-attributes  -o  $@ $< $(INCLUDE_PATH) # -I/where/you/have/Vc
 
 gray_scott: $(OBJ)
-	$(CC) -o $@ $^ $(CFLAGS) $(LIBS_PATH) $(LIBS) -L/home/i-bird/VCDEVEL/lib   -lVc #(Add -lVc if you use VCDevel)
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS_PATH) $(LIBS) -L/home/i-bird/VCDEVEL/lib  # -lVc (Add -lVc if you use VCDevel)
 
 all: gray_scott
 
diff --git a/example/Grid/3_gray_scott_3d_vectorization/main.cpp b/example/Grid/3_gray_scott_3d_vectorization/main.cpp
index 76ecebd402527bef5fa392ebda0e8052a6d95f26..cf1ee02c1f0c1b1e64f49d089657996b7796e9e8 100644
--- a/example/Grid/3_gray_scott_3d_vectorization/main.cpp
+++ b/example/Grid/3_gray_scott_3d_vectorization/main.cpp
@@ -2,7 +2,7 @@
 #include "data_type/aggregate.hpp"
 #include "timer.hpp"
 
-//#define FORTRAN_UPDATE
+#define FORTRAN_UPDATE
 
 #ifndef FORTRAN_UPDATE
 #include "Vc/Vc"