diff --git a/QOD-December-2023.md b/QOD-December-2023.md
index 6999120..59e41d1 100644
--- a/QOD-December-2023.md
+++ b/QOD-December-2023.md
@@ -19,6 +19,8 @@ No | Title | Time | Speaker | Country | Language
 1 | How to Make Beautiful 3-D Georefernced Map using QGIS and Blender | [09H00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?year=2023&month=12&day=08&hour=19&min=00&sec=00&msg=QGISOpenDay-session2 "click this link to find out the time in your local time zone") | Hemed Lungo | Tanzania | English 
 2 | QGIS Plugin AIAMAS | [10H00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?year=2023&month=12&day=08&hour=10&min=00&sec=00&msg=QGISOpenDay-session2 "click this link to find out the time in your local time zone") | Stefan Keller, FH OST | Switzerland | english 
 3 | Festive freestyle session | [14H00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?year=2023&month=12&day=08&hour=14&min=00&sec=00&msg=QGISOpenDay-session2 "click this link to find out the time in your local time zone") | Amy and QGIS Community| Global | English 
+4 | Expressions and atlas
+symbology | [15H00 UTC](https://www.timeanddate.com/worldclock/fixedtime.html?year=2023&month=12&day=08&hour=15&min=00&sec=00&msg=QGISOpenDay-session2 "click this link to find out the time in your local time zone") | Heidrun | Global | English 
 
 # Organisers