diff --git a/README.md b/README.md
index 13eed6f..b7c901a 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,7 @@ HOST=localhost PORT=1234 YPERSISTENCE=./dbDir node ./node_modules/y-websocket/bi
 
 ### Websocket Server with HTTP callback
 
-Send a debounced callback to an HTTP server (`POST`) on document update.
+Send a debounced callback to an HTTP server (`POST`) on document update. Note that this implementation doesn't implement a retry logic in case the `CALLBACK_URL` does not work.
 
 Can take the following ENV variables: