diff --git a/src/audio/n3ds/SDL_n3dsaudio.c b/src/audio/n3ds/SDL_n3dsaudio.c
index efc26542ae..31be34c3f1 100644
--- a/src/audio/n3ds/SDL_n3dsaudio.c
+++ b/src/audio/n3ds/SDL_n3dsaudio.c
@@ -32,6 +32,7 @@
 static dspHookCookie dsp_hook;
 static SDL_AudioDevice *audio_device;
 
+// fully local functions related to the wavebufs / DSP, not the same as the `device->lock` SDL_Mutex!
 static SDL_INLINE void contextLock(SDL_AudioDevice *device)
 {
     LightLock_Lock(&device->hidden->lock);