diff --git a/admin/tours_sa.php b/admin/tours_sa.php
index 994ebe7..cb77b35 100644
--- a/admin/tours_sa.php
+++ b/admin/tours_sa.php
@@ -69,8 +69,15 @@ set_percent(0);
 	- Foreach student in a tour
 		+15 - Above the grade level
 		+25 - Below the grade level
-
-	
+		+5 - Noone from the same school
+		If ranked (rank=1,2,3,4,...):
+		+(rank*rank*5 - 5) = +0, +15, +40, +75
+		If not ranked:
+		+(max_choices*max_choices*5) (always greater than ranked)
+	- Foreach tour
+		+100 for each student above the capacity
+		+200 for each student below 1/4 the capacity,but
+			zero if the tour is empty
 */
 
 /* Compute the cost of adding a judge to a team */
@@ -95,7 +102,11 @@ function tour_cost_function($annealer, $bucket_id, $ids)
 	/* Compute the over max / under min costs */
 	$c = count($ids);
 	$over = ($c > $t['capacity']) ? $c - $t['capacity'] : 0;
-	$under = ($c < ($t['capacity']/4)) ? ($t['capacity']/4) - $c : 0;
+	if($c > 0) 
+		$under = ($c < ($t['capacity']/4)) ? ($t['capacity']/4) - $c : 0;
+	else 
+		$under = 0;
+	
 	$cost += $over * 100;
 	$cost += $under * 200;