diff --git a/index.qmd b/index.qmd
index 4ccc5d1..7f3485d 100644
--- a/index.qmd
+++ b/index.qmd
@@ -9,7 +9,11 @@ about:
       aria-label: "GitHub logo linking to mcanouil/quarto-extensions repository"
 ---
 
-This website is a listing of [Quarto](https://quarto.org) extensions.
+:::{.callout-note}
+This is a proof of concept.
+:::
+
+This is a listing of Quarto extensions hosted on GitHub and using GitHub API to retrieve information from the repositories.
 
 You can submit a new extension by making a pull request to the [GitHub repository](https://github.com/mcanouil/quarto-extensions/edit/main/extensions/quarto-extensions.csv).