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diff --git a/mkdocs.yml b/mkdocs.yml
index 026eecdd5bd64ef93afe132695234cde9b272338..15bc6ea2c7f09d559de20ef19b252d626f4fd370 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -48,4 +48,4 @@ markdown_extensions:
       alternate_style: true
 nav:
   - index.md
-  - 1. lecke: lectures/01.md
+  - 1. lecke: lectures/01/index.md