diff --git a/tt/sum.sh b/tt/sum.sh
index 29bce12..2d66b1a 100755
--- a/tt/sum.sh
+++ b/tt/sum.sh
@@ -7,5 +7,7 @@ function get_sum() {
 hil=$(get_sum "HIL")
 ste=$(get_sum "STE")
 total=$(echo "$hil+$ste" | bc)
+hil_perc=$(echo "$hil*100/$total" | bc)
+ste_perc=$(echo "$ste*100/$total" | bc)
 
-echo -e "HIL:\t$hil\nSTE:\t$ste\nTotal:\t$total"
+echo -e "HIL:\t$hil\t(${hil_perc}%)\nSTE:\t$ste\t(${ste_perc}%)\nTotal:\t$total"