diff --git a/serverless/cloudflare/README.md b/serverless/cloudflare/README.md
index 412c10a..9c2b0e9 100644
--- a/serverless/cloudflare/README.md
+++ b/serverless/cloudflare/README.md
@@ -12,7 +12,7 @@ Publish the worker: `npm run deploy`
 
 # Settings
 
-By default, your worker will serve tiles at path `NAME/0/0/0.pbf` using the archive at the root of your bucket `NAME.pmtiles`.
+By default, your worker will serve tiles at path `NAME/0/0/0.EXT` using the archive at the root of your bucket `NAME.pmtiles`, where EXT is one of `mvt`, `png`, `jpg` or `webp` depending on the tileset.
 
 This behavior can be customized with optional environment variables:
 
@@ -20,4 +20,4 @@ This behavior can be customized with optional environment variables:
 
 # Using the Workers web editor
 
-Generate the Workers script using `npm run build` and copy `dist/index.js` to the editor.
\ No newline at end of file
+Generate the Workers script using `npm run build` and copy `dist/index.js` to the editor.