diff --git a/audio/echo/source/main.c b/audio/echo/source/main.c
index 41683d3..9dc087c 100644
--- a/audio/echo/source/main.c
+++ b/audio/echo/source/main.c
@@ -5,6 +5,10 @@
 
 #include <switch.h>
 
+// Example for audio capture and playback.
+// This example continuously records audio data from the default input device (see libnx audin.h),
+// and sends it to the default audio output device (see libnx audout.h).
+
 #define SAMPLERATE 48000
 #define CHANNELCOUNT 2
 #define FRAMERATE (1000 / 30)