diff --git a/docs/_docs/03-installation.md b/docs/_docs/03-installation.md
index ec12124b..9bd73655 100644
--- a/docs/_docs/03-installation.md
+++ b/docs/_docs/03-installation.md
@@ -84,6 +84,7 @@ gem "minimal-mistakes-jekyll"
 #   gem "jekyll-include-cache"
 #
 # If you have any other plugins, put them here!
+# Cf. https://jekyllrb.com/docs/plugins/installation/
 group :jekyll_plugins do
 end
 ```