diff --git a/docs/workshop/1-passsive-ddos/bsvol.tex b/docs/workshop/1-passsive-ddos/bsvol.tex
index a049f6b..2208aa7 100644
--- a/docs/workshop/1-passsive-ddos/bsvol.tex
+++ b/docs/workshop/1-passsive-ddos/bsvol.tex
@@ -60,7 +60,7 @@
 \put(1439.0,190.0){\rule[-0.200pt]{0.400pt}{141.167pt}}
 \put(231.0,776.0){\rule[-0.200pt]{291.007pt}{0.400pt}}
 \put(261,747){\makebox(0,0)[l]{https://www.circl.lu/}}
-\put(30,483){\makebox(0,0){Number of packets}}
+\put(15,483){\makebox(0,0){\rotatebox{90}{Number of packets}}}
 \put(835,29){\makebox(0,0){date (month / day)}}
 \put(835,838){\makebox(0,0){Backscatter traffic volume per 5 minutes in 2019}}
 \put(1279,735){\makebox(0,0)[r]{backscatter}}