diff --git a/modules/audio/audio_policy.c b/modules/audio/audio_policy.c
index 06ac976..905c210 100644
--- a/modules/audio/audio_policy.c
+++ b/modules/audio/audio_policy.c
@@ -62,6 +62,7 @@
 {
 }
 
+// deprecated, never called
 static void ap_set_ringer_mode(struct audio_policy *pol, uint32_t mode,
                                uint32_t mask)
 {