Index: wp-includes/taxonomy.php
===================================================================
--- wp-includes/taxonomy.php	(revision 24811)
+++ wp-includes/taxonomy.php	(working copy)
@@ -2105,7 +2105,7 @@
 			$term_id = (int) $wpdb->insert_id;
 		} elseif ( $exists = term_exists( (int) $term_id, $taxonomy ) )  {
 			// Same name, same slug.
-			return new WP_Error('term_exists', __('A term with the name provided already exists.'), $exists['term_id']);
+			return new WP_Error('term_exists', __('A term with the name and slug provided already exists.'), $exists['term_id']);
 		}
 	} else {
 		// This term does not exist at all in the database, Create it.