diff --git a/broadcastradio/1.1/default/Tuner.h b/broadcastradio/1.1/default/Tuner.h
index 17ee99f..5c8a7e5 100644
--- a/broadcastradio/1.1/default/Tuner.h
+++ b/broadcastradio/1.1/default/Tuner.h
@@ -65,6 +65,7 @@
     ProgramInfo mCurrentProgramInfo = {};
 
     void tuneInternalLocked(const ProgramSelector& sel);
+    bool isFmLocked();  // TODO(b/36864090): make it generic, not FM only
 };
 
 }  // namespace implementation