diff --git a/aos/util/log_interval.h b/aos/util/log_interval.h
index 69170e4..acd32e8 100644
--- a/aos/util/log_interval.h
+++ b/aos/util/log_interval.h
@@ -28,6 +28,7 @@
 
   void WantToLog() {
     if (count_ == 0) {
+      // TODO(austin): event loops!
       last_done_ = ::aos::monotonic_clock::now();
     }
     ++count_;