diff --git a/ext/numo/narray/numo/template.h b/ext/numo/narray/numo/template.h
index e81de621..f580d8b7 100644
--- a/ext/numo/narray/numo/template.h
+++ b/ext/numo/narray/numo/template.h
@@ -1,5 +1,5 @@
 /*
-  narray.h
+  template.h
   Numerical Array Extension for Ruby
     (C) Copyright 1999-2003 by Masahiro TANAKA
 
diff --git a/ext/numo/narray/struct.c b/ext/numo/narray/struct.c
index 4b159d42..83075dda 100644
--- a/ext/numo/narray/struct.c
+++ b/ext/numo/narray/struct.c
@@ -1,5 +1,5 @@
 /*
-  nstrut.c
+  struct.c
   Numerical Array Extension for Ruby
     (C) Copyright 1999-2007,2013 by Masahiro TANAKA