diff --git a/ox-reveal.el b/ox-reveal.el
index d2de629..c3d4ce1 100644
--- a/ox-reveal.el
+++ b/ox-reveal.el
@@ -101,6 +101,7 @@
     (:reveal-single-file nil "reveal_single_file" org-reveal-single-file t)
     (:reveal-extra-script "REVEAL_EXTRA_SCRIPT" nil org-reveal-extra-script space)
     (:reveal-extra-script-src "REVEAL_EXTRA_SCRIPT_SRC" nil org-reveal-extra-script-src split)
+    (:reveal-extra-script-before-src "REVEAL_EXTRA_SCRIPT_BEFORE_SRC" nil org-reveal-extra-script-before-src split)
     (:reveal-init-options "REVEAL_INIT_OPTIONS" nil org-reveal-init-options newline)
     (:reveal-highlight-css "REVEAL_HIGHLIGHT_CSS" nil org-reveal-highlight-css nil)
     (:reveal-reveal-js-version "REVEAL_REVEAL_JS_VERSION" nil nil t)
@@ -321,7 +322,12 @@ Example:
   :type 'string)
 
 (defcustom org-reveal-extra-script-src '()
-  "Custom script source that will be embedded in a <script src> tag."
+  "Custom script source that will be embedded in a <script src> tag, after the call to Reveal.initialize()."
+  :group 'org-export-reveal
+  :type 'list)
+
+(defcustom org-reveal-extra-script-before-src '()
+  "Custom script source that will be embedded in a <script src> tag, before the call to Reveal.initialize()."
   :group 'org-export-reveal
   :type 'list)
 
@@ -769,6 +775,18 @@ custom variable `org-reveal-root'."
      ;; plugin headings
      (if-format "%s\n" (car reveal-4-plugin))
 
+     ;; Extra <script src="..."></script> tags before the call to Reveal.initialize()
+     (let ((before-src-list (let ((l (plist-get info :reveal-extra-script-before-src)))
+                              ;; map to a single string to a list.
+                              (if (stringp l)
+                                  (list l)
+                                l))))
+       (and before-src-list
+            (mapconcat (lambda (src) (format "<script src=\"%s\"></script>" src))
+                       before-src-list
+                       "\n")))
+
+
      ;; Reveal.initialize
      (let ((reveal-4-plugin-statement (cdr reveal-4-plugin))
            (init-options (plist-get info :reveal-init-options))