diff --git a/piker/brokers/binance/feed.py b/piker/brokers/binance/feed.py
index a3e1f091..53a5073d 100644
--- a/piker/brokers/binance/feed.py
+++ b/piker/brokers/binance/feed.py
@@ -108,6 +108,7 @@ class AggTrade(Struct, frozen=True):
     m: bool  # Is the buyer the market maker?
     M: bool|None = None  # Ignore
     nq: float|None = None # Normal quantity without the trades involving RPI orders
+    # ^XXX https://developers.binance.com/docs/derivatives/change-log#2025-12-29
 
 
 async def stream_messages(