diff --git a/RELEASENOTES-DEVELOPMENT.md b/RELEASENOTES-DEVELOPMENT.md
index 64460da2..cf4e5bcd 100644
--- a/RELEASENOTES-DEVELOPMENT.md
+++ b/RELEASENOTES-DEVELOPMENT.md
@@ -1,3 +1,8 @@
+Version 4.3.2-dev-56-g4cd3c1da
+===
+**Investigation**
+* Return `200` -- "OK" in response to a `POST` message with the argument `/feedback` on a Classic AirPlay connection. Continue to return `500` -- "Internal Server Error" for all other `POST` messages. This is part of an investigation into [Issue #1745](https://github.com/mikebrady/shairport-sync/issues/1745).
+
 Version 4.3.2-dev-51-g98679bbb
 ===
 **Enhancement**