diff --git a/protocols/airspy_adsb.md b/protocols/airspy_adsb.md
index d28f1b0..bac3056 100644
--- a/protocols/airspy_adsb.md
+++ b/protocols/airspy_adsb.md
@@ -1,5 +1,9 @@
 # Airspy ADSB protocol
 
+**DEPRECATED**
+
+*This protocol is no longer used by airspy_adsb*
+
 ## Ports
 
 * ??: server -> client feed