Update fortran_ex.md

WonyoungCho · Nov 26, 2018 · 5c5465a · 5c5465a
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diff --git a/docs/fortran_ex.md b/docs/fortran_ex.md
@@ -801,6 +801,7 @@ $ ./a.out
 ```
 
 # Value attribute
+**subprogram**에서의 값은 변경될 수 있지만, 실제 **argument** 값은 변하지 않는다.
 ```fortran
 program value
   implicit none