diff --git a/src/ch05-00-function.md b/src/ch05-00-function.md
index b9c8825..5ac863b 100644
--- a/src/ch05-00-function.md
+++ b/src/ch05-00-function.md
@@ -44,7 +44,7 @@ end function vector_norm
 
 function double_vec(vec) result(vec2)
   real, intent(in) :: vec(:)
-  real :: vec2(size(vec))   !可以返回数组
+  real :: vec2(size(vec))   !可以返回数组，但是具有dimension属性，不能写在开头
 
   vec2=vec*2