diff --git a/gstlal/lib/gstlal/gstlal_peakfinder_top.h b/gstlal/lib/gstlal/gstlal_peakfinder_top.h
index f6693648eeb816b2c5b0e5ca803c4209d2a2f2aa..a05832188ddd4b6441f7897cdabd61180221c5ea 100644
--- a/gstlal/lib/gstlal/gstlal_peakfinder_top.h
+++ b/gstlal/lib/gstlal/gstlal_peakfinder_top.h
@@ -47,6 +47,7 @@ struct gstlal_peak_state {
 	/* Interpolator */
 	LanczosTriggerInterpolant *interp;
 
+	/* FIXME I think is_gap is unused, we should delete it */
 	gboolean is_gap;
 	gboolean no_peaks_past_threshold;
 };