Juelich-Challenges-Hackathon.md

@@ -19,7 +19,7 @@ The Juelich Challenges is a JULAIN initiative for 2 years now. It is recognized
 # Links
 
 # Material
-Welcome and organisational remarks [slides](https://gitlab.version.fz-juelich.de/MLDL_FZJ/MLDL_FZJ_Wiki/-/blob/master/files/JournalClub/21-03-16-JuelichChallenges_Hackathon/21-03-16-JuelichChallenges_Hackathon)
+Welcome and organisational remarks [slides](https://gitlab.version.fz-juelich.de/MLDL_FZJ/MLDL_FZJ_Wiki/-/blob/master/files/JournalClub/21-03-16-JuelichChallenges_Hackathon/21-03-16-JUCHA-Welcome.pdf)
 
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