Index: src/wp-includes/pluggable.php
===================================================================
--- src/wp-includes/pluggable.php	(revision 49621)
+++ src/wp-includes/pluggable.php	(working copy)
@@ -1986,11 +1986,13 @@
 		// We want to reverse this for the plain text arena of emails.
 		$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
 
+		$homeurl = home_url( '/' );
+
 		if ( 'user' !== $notify ) {
 			$switched_locale = switch_to_locale( get_locale() );
 
-			/* translators: %s: Site title. */
-			$message = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
+			/* translators: 1: Site title. 2 Site URL */
+			$message = sprintf( __( 'New user registration on your site %1$s ( %2$s ):' ), $blogname, $homeurl ) . "\r\n\r\n";
 			/* translators: %s: User login. */
 			$message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
 			/* translators: %s: User email address. */