Index: wp-content/themes/twentyfourteen/inc/custom-header.php
===================================================================
--- wp-content/themes/twentyfourteen/inc/custom-header.php	(revision 26556)
+++ wp-content/themes/twentyfourteen/inc/custom-header.php	(working copy)
@@ -68,7 +68,8 @@
 		// Has the text been hidden?
 		if ( 'blank' == $header_text_color ) :
 	?>
-		.site-title {
+		.site-title,
+		.site-description {
 			position: absolute !important;
 			clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
 			clip: rect(1px, 1px, 1px, 1px);