diff --git a/README.md b/README.md
index 8a3a954..5b61833 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ eink-feed-server
 - `GET /api/channel?id=<CHANNEL_ID>`:
   Returns channel configuration. Can be used by a rendering server to get display information about the image channel.
 - `POST /api/frame?id=<CHANNEL_ID>&orientation=<(portrait|landscape)_(left|right)>`:
-  Accepts a multipart form with a BMP or PNG.
+  Accepts a multipart form with a PNG (or BMP) file.
 - `/api/ws/display`:
   WebSocket endpoint for protobuf communication between a display client and the server. Image data is sent over this socket.