Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php	(revision 18064)
+++ wp-includes/link-template.php	(working copy)
@@ -1958,6 +1958,8 @@
  * @return string Home url link with optional path appended.
 */
 function get_home_url( $blog_id = null, $path = '', $scheme = null ) {
+	do_action( 'pre_get_home_url' );
+	
 	$orig_scheme = $scheme;
 
 	if ( !in_array( $scheme, array( 'http', 'https' ) ) )