diff --git a/_quarto.yml b/_quarto.yml
index 6afbb04..1e6e50f 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -10,6 +10,7 @@ book:
       - intro.qmd
   - part: 1-reproducible-research.qmd
     chapters:
+    - 1-1-what-is-reproducible-research.qmd
     - 1-2-hurdles.qmd
     - 1-3-fair.qmd
     - 1-4-team-work.qmd