diff --git a/Readme.org b/Readme.org
index 435ba67..f2f7df3 100644
--- a/Readme.org
+++ b/Readme.org
@@ -7,6 +7,9 @@
 #+REVEAL_THEME: moon
 #+REVEAL_HLEVEL: 2
 
+#+REVEAL_PREAMBLE: my-preamble
+#+REVEAL_POSTAMBLE: <p> This is the postamble. </p>
+
 * Reveal.js and Org-Reveal
 
   - *Reveal.js* is a tool for creating good-looking HTML presentations,
@@ -270,6 +273,48 @@ $ git clone https://github.com/yjwen/org-reveal.git
    installation, set option =REVEAL_MATH_JAX_URL= to the URL pointing
    to the local MathJax location.
    
+** Preamble and Postamble
+
+   You can define preamble and postamble contents which will not be
+   shown as slides, but will be exported into the body part of the
+   generated HTML file, at just before and after the slide contents.
+
+   Change preamble and postamble contents globally by setting variable
+   =org-reveal-preamble= and =org-reveal-postamble=.
+
+   Change preamble and postamble contents locally by setting options
+   =REVEAL_PREAMBLE= and =REVEAL_POSTAMBLE=, as illustrated at the
+   heading part of this document.
+
+*** Generating Pre/Postamble by Emacs-Lisp Functions
+
+    If the contents of pre/postamble is the name of an evaluated
+    Emacs-Lisp funtion, which must accept an argument of Org-mode
+    info and return a string, the returned string will be taken
+    as pre/postamble contents.
+
+    So you can embed the Emacs-Lisp function as an Org-Babel source
+    block and mark it to be evaluated at exporting the document.
+
+    In this document, the =REVEAL_PREAMBLE= option is set to
+    =my-preamble=, now we will define =my-preamble= in an Org-Bable
+    source block, as illustrated below (invisible in the slides).
+
+#+BEGIN_SRC emacs-lisp :exports results :results silent
+  (defun my-preamble (info)
+    ""
+    "<p>
+  Thanks to Org-Babel, now we can embed preambles into Org document!
+  </p>")
+  
+#+END_SRC
+
+    The =:exports results :result silent= options mark the source
+    block to be evaluated at exporting and the evaluation result
+    is omitted, so it won't disturb slide contents.
+
+    Check the generated HTML to see how it works.
+
 * Tips
 
 ** Disable Heading Numbers
diff --git a/ox-reveal.el b/ox-reveal.el
index 016d839..e9a97c7 100644
--- a/ox-reveal.el
+++ b/ox-reveal.el
@@ -54,6 +54,8 @@
     (:reveal-hlevel "REVEAL_HLEVEL" nil nil t)
     (:reveal-mathjax nil "reveal_mathjax" org-reveal-mathjax t)
     (:reveal-mathjax-url "REVEAL_MATHJAX_URL" nil org-reveal-mathjax-url t)
+    (:reveal-preamble "REVEAL_PREAMBLE" nil org-reveal-preamble t)
+    (:reveal-postamble "REVEAL_POSTAMBLE" nil org-reveal-postamble t)
     )
 
   :translate-alist
@@ -162,6 +164,17 @@ can be include."
   :group 'org-export-reveal
   :type 'string)
 
+(defcustom org-reveal-preamble nil
+  "Preamble contents."
+  :group 'org-export-reveal
+  :type 'string)
+
+(defcustom org-reveal-postamble nil
+  "Postamble contents."
+  :group 'org-export-reveal
+  :type 'string)
+
+
 (defun if-format (fmt val)
   (if val (format fmt val) ""))
 
@@ -517,6 +530,19 @@ the plist used as a communication channel."
                            (org-export-read-attribute :attr_reveal paragraph :frag))
                 contents)))))
 
+(defun org-reveal--build-pre/postamble (type info)
+  "Return document preamble or postamble as a string, or nil."
+  (let ((section (plist-get info (intern (format ":reveal-%s" type))))
+        (spec (org-html-format-spec info)))
+    (when section
+      (let ((section-contents
+             (if (functionp (intern section)) (funcall (intern section) info)
+               ;; else section is a string.
+               (format-spec section spec))))
+        (when (org-string-nw-p section-contents)
+           (org-element-normalize-string section-contents))))))
+        
+
 (defun org-reveal-section (section contents info)
   "Transcode a SECTION element from Org to HTML.
 CONTENTS holds the contents of the section. INFO is a plist
@@ -540,8 +566,9 @@ info is a plist holding export options."
    (org-reveal-stylesheets info)
    (org-reveal-mathjax-scripts info)
    "</head>
-<body>
-<div class=\"reveal\">
+<body>\n"
+   (org-reveal--build-pre/postamble 'preamble info)
+"<div class=\"reveal\">
 <div class=\"slides\">
 <section>
 "
@@ -550,6 +577,7 @@ info is a plist holding export options."
    contents
    "</div>
 </div>\n"
+   (org-reveal--build-pre/postamble 'postamble info)
    (org-reveal-scripts info)
    "</body>
 </html>\n"))