mwim-end-of-code doesn't work with org-mode

before I use mwim-end-of-code 
```
#+begin_src emacs-lisp
(somth[cursor]ing nil) ; this is a comment
#+end_src
```
after I use mwim-end-of-code it just go to end of line
```
#+begin_src emacs-lisp
(somthing nil) ; this is a comment [cursor]
#+end_src
```
but it works pretty well in .el file , it just not work in org-mode