diff --git a/inputs/intro.tex b/inputs/intro.tex
index 787e8d1..9b141c8 100644
--- a/inputs/intro.tex
+++ b/inputs/intro.tex
@@ -12,6 +12,9 @@ If you find errors or want to improve something,
 please send me a message:\\
 \texttt{lecturenotes@jrpie.de}.
 
+Many thanks to \textsc{Mirko Bartsch} for providing notes on lectures
+I could not attend!
+
 This notes follow the way the material was presented in the lecture rather
 closely. Additions (e.g.~from exercise sheets)
 and slight modifications have been marked with $\dagger$.