diff --git a/project_description.md b/project_description.md
index 3b79cfa461de8625e59a5c3df7a893c5205979e4..809c4044a9d51a92cc6ffd75dbca334ef45be8ea 100644
--- a/project_description.md
+++ b/project_description.md
@@ -79,7 +79,7 @@ This is coming to the end but its also quite far away, so the goals here are a b
 * https://www.cita.utoronto.ca/presentation-archive/?talk_id=768
 * http://online.kitp.ucsb.edu/online/bholes_c13/sigurdsson/
 * https://www.cita.utoronto.ca/presentation-archive/?talk_id=646
-
+* http://online.kitp.ucsb.edu/online/gravast_c19/mapelli/rm/jwvideo.html !
 
 ## Contact:
 [David Hendriks](mailto:d.hendriks@surrey.ac.uk)