diff --git a/slides/lectures/resources/concurrency/slides.md b/slides/lectures/resources/concurrency/slides.md
index 66e51965085bd685502e3e2e02f7a9d133634837..74315c7fa6b4e7d93c9a480bc54b6a053506b852 100644
--- a/slides/lectures/resources/concurrency/slides.md
+++ b/slides/lectures/resources/concurrency/slides.md
@@ -79,7 +79,7 @@ layout: two-cols
 
 :: right ::
 
-```mermaid
+```mermaid {scale: 0.6}
 sequenceDiagram
     autonumber
     loop