diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index 1088f9b..6e50f21 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -286,10 +286,12 @@
       // Enables the analog gain controller functionality.
       struct AnalogGainController {
         bool enabled = true;
+        // TODO(bugs.webrtc.org/1275566): Describe `startup_min_volume`.
         int startup_min_volume = kAgcStartupMinVolume;
         // Lowest analog microphone level that will be applied in response to
         // clipping.
         int clipped_level_min = kClippedLevelMin;
+        // If true, an adaptive digital gain is applied.
         bool enable_digital_adaptive = true;
         // Amount the microphone level is lowered with every clipping event.
         // Limited to (0, 255].