diff --git a/README.md b/README.md
index 849a42f..f4010fa 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [git.gay](https://git.gay)'s thumbnail server, inspired by GitHub's.
 
-![A demo thumbnail for this repository](https://og.git.gay/gitgay/og)
+![A demo thumbnail for this repository, generated by this project](https://og.git.gay/gitgay/og?format=svg)
 
 Made with [@besties/html2png](https://git.gay/besties/html2png), itself a wrapper for [satori](https://www.npmjs.com/package/satori) and [@resvg/resvg-wasm](https://www.npmjs.com/package/@resvg/resvg-wasm).