Index: wp-content/themes/twentythirteen/css/editor-style.css
===================================================================
--- wp-content/themes/twentythirteen/css/editor-style.css	(revision 24296)
+++ wp-content/themes/twentythirteen/css/editor-style.css	(working copy)
@@ -341,4 +341,30 @@
 	line-height: 1.5;
 	margin-bottom: 24px;
 	padding: 0;
-}
\ No newline at end of file
+}
+
+
+/**
+ * RTL
+ * ----------------------------------------------------------------------------
+ */
+
+html .mceContentBody.rtl {
+	direction: rtl;
+	unicode-bidi: embed;
+}
+
+.rtl ol,
+.rtl ul {
+	padding: 0 40px 0 0;
+}
+
+.rtl .wp-caption,
+.rtl tr th {
+	text-align: right;
+}
+
+.rtl td {
+	padding: 6px 0 6px 10px;
+	text-align: right;
+}
Index: wp-content/themes/twentythirteen/css/editor-style-rtl.css
===================================================================
--- wp-content/themes/twentythirteen/css/editor-style-rtl.css	(revision 24296)
+++ wp-content/themes/twentythirteen/css/editor-style-rtl.css	(working copy)
@@ -1,7 +0,0 @@
-/*
-Theme Name: Twenty Thirteen
-Description: Used to style the TinyMCE editor for RTL languages.
-See also rtl.css file.
-*/
-
-/* TODO */
\ No newline at end of file