diff --git a/conf/config.example.toml b/conf/config.example.toml
index 018a3d3..94b5237 100644
--- a/conf/config.example.toml
+++ b/conf/config.example.toml
@@ -16,7 +16,7 @@ clone-url = "https://codeberg.org/<user>/<project>.git"
 index-repo = "pages"
 index-repo-branch = "main"
 authorization = "forgejo"
-max-preview-lifetime = "7d"
+max-preview-lifetime = 7 # in days
 
 [fallback] # non-default section
 proxy-to = "https://codeberg.page"