diff --git a/book/en/_toc.yml b/book/en/_toc.yml
index 1a48c19..37b607b 100644
--- a/book/en/_toc.yml
+++ b/book/en/_toc.yml
@@ -35,6 +35,7 @@ parts:
     chapters:
       - file: labs/nlp4ss-lab-1
       - file: labs/nlp4ss-lab-2
+      - file: labs/nlp4ss-lab-3
   - caption: About
     chapters:
       - file: syllabus/index