diff --git a/libretro-common/include/libretro.h b/libretro-common/include/libretro.h
index 7d0cf19a20..6155be31a2 100644
--- a/libretro-common/include/libretro.h
+++ b/libretro-common/include/libretro.h
@@ -1114,6 +1114,14 @@ struct retro_led_interface
 };
 
 #define RETRO_ENVIRONMENT_GET_AUDIO_VIDEO_ENABLE (47 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+                                           /* int * --
+                                            * Queries the frontend if audio and video are enabled or not.
+                                            * If not enabled, the frontend will discard the audio or video,
+                                            * so the core may decide to skip producing audio or video.
+                                            * Bit 0 (value 1) is set if Video is enabled,
+                                            * Bit 1 (value 2) is set if Audio is enabled.
+                                            * Other bits are reserved for future use.
+                                            */
 
 #define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL)
                                            /* const struct retro_hw_render_interface ** --