Update documentation and changelog

README.org

@@ -92,6 +92,12 @@ following example, the ~:session~ argument has been changed to
 Executing this code block will add a window, ~new-window~, to your
 session.
 
+You can parameterize scripts by using ~:var variable="value"~. This will add a
+line containing =variable="value"= preceding the content body.
+: #+begin_src tmux :var name="Ismael"
+: echo hello ${name}
+: #+end_src
+
 You can exit your tmux session by detaching. The terminal window will
 close automatically. Ob-tmux will not detect that you have
 detached. Any commands you send will be sent to the tmux session in

changelog.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Deprecated
 - Possibility to configure terminal using org-babel header arguments.
 ### Added
+- Add possibility to define variables (Thanks to KaiHa!)
 - Add installation instructions for MELPA.
 - Add possibility to configure terminal and add options to the
   terminal. (Thanks to dkrm0!)