diff --git a/index.rmd b/index.rmd
index abc6c8d..9e6482f 100644
--- a/index.rmd
+++ b/index.rmd
@@ -20,7 +20,7 @@ please make a donation to [Kākāpō Recovery](https://www.doc.govt.nz/kakapo-do
 
 Please note that R4DS uses a [Contributor Code of Conduct](https://contributor-covenant.org/version/2/0/CODE_OF_CONDUCT.html). By contributing to this book, you agree to abide by its terms.
 
-## Acknowledgements
+## Acknowledgements {-}
 
 R4DS is hosted on <https://www.netlify.com>.