Index: nav-menu.php
===================================================================
--- nav-menu.php	(revision 19312)
+++ nav-menu.php	(working copy)
@@ -489,7 +489,8 @@
 	$menu_locations = get_nav_menu_locations();
 	$num_locations = count( array_keys($locations) );
 
-	echo '<p class="howto">' . sprintf( _n('Your theme supports %s menu. Select which menu you would like to use.', 'Your theme supports %s menus. Select which menu appears in each location.', $num_locations ), number_format_i18n($num_locations) ) . '</p>';
+	$text = apply_filters( 'nav_menu_theme_support_text' , _n('Your theme supports %s menu. Select which menu you would like to use.', 'Your theme supports %s menus. Select which menu appears in each location.', $num_locations ) , $num_locations );
+	echo '<p class="howto">' . sprintf( $text , number_format_i18n($num_locations) ) . '</p>';
 
 	foreach ( $locations as $location => $description ) {
 		?>