diff --git a/doc/tutorial_01_add_log.md b/doc/tutorial_01_add_log.md
index e703862..79dbc0d 100644
--- a/doc/tutorial_01_add_log.md
+++ b/doc/tutorial_01_add_log.md
@@ -14,9 +14,9 @@ Declaring the list of macro                                         {#elog_tutor
 ===========================
 
 
-**debug.h**
+**debug.hpp**
 
-@include sample/debug.h
+@include sample/debug.hpp
 
 **debug.cpp**