Index: wp-includes/canonical.php
===================================================================
--- wp-includes/canonical.php	(revision 28676)
+++ wp-includes/canonical.php	(working copy)
@@ -40,7 +40,7 @@
 	global $wp_rewrite, $is_IIS, $wp_query, $wpdb;

 	// If we're not in wp-admin and the post has been published and preview nonce
-	// is non-existant or invalid then no need for preview in query
+	// is non-existent or invalid then no need for preview in query
 	if ( is_preview() && get_query_var( 'p' ) && 'publish' == get_post_status( get_query_var( 'p' ) ) ) {
 		if ( ! isset( $_GET['preview_id'] )
 			|| ! isset( $_GET['preview_nonce'] )