diff --git a/ox-reveal.el b/ox-reveal.el
index 2793eb9..5250876 100644
--- a/ox-reveal.el
+++ b/ox-reveal.el
@@ -60,6 +60,7 @@
     (:reveal-trans "REVEAL_TRANS" nil nil t)
     (:reveal-speed "REVEAL_SPEED" nil nil t)
     (:reveal-theme "REVEAL_THEME" nil org-reveal-theme t)
+    (:reveal-theme-custom "REVEAL_THEME_CUSTOM" nil nil nil)
     (:reveal-extra-css "REVEAL_EXTRA_CSS" nil org-reveal-extra-css newline)
     (:reveal-extra-js "REVEAL_EXTRA_JS" nil org-reveal-extra-js nil)
     (:reveal-extra-initial-js "REVEAL_EXTRA_INITIAL_JS" nil org-reveal-extra-initial-js newline)
@@ -638,10 +639,12 @@ using custom variable `org-reveal-root'."
          (version (org-reveal--get-reveal-js-version info))
          (reveal-css (org-reveal--choose-path root-path version "dist/reveal.css" "css/reveal.css"))
          (theme (plist-get info :reveal-theme))
-         (theme-css (org-reveal--choose-path root-path
-                                             version
-                                             (concat "dist/theme/" theme ".css")
-                                             (concat "css/theme/" theme ".css")))
+         (theme-css (if (string-equal "custom" (downcase theme))
+                        (plist-get info :reveal-theme-custom)
+                      (org-reveal--choose-path root-path
+                                               version
+                                               (concat "dist/theme/" theme ".css")
+                                               (concat "css/theme/" theme ".css"))))
          (extra-css (plist-get info :reveal-extra-css))
          (in-single-file (plist-get info :reveal-single-file)))
     (concat