diff --git a/register_participants_students.php b/register_participants_students.php
index 1ba48c1..78f7528 100644
--- a/register_participants_students.php
+++ b/register_participants_students.php
@@ -370,7 +370,7 @@ else
 		echo "		<option $sel value=\"xlarge\">".i18n("X-Large")."</option>";
 		echo " </select>";
 		if($tshirt_cost != 0.0) {
-			printf(" The cost of each T-Shirt is $%.2f", $tshirt_cost);
+			printf(" The cost of each T-Shirt is $%.2f, sizes are Adult sizes.", $tshirt_cost);
 		}
 		echo "</td>\n";
 		echo "</tr>";