diff --git a/GB_set_sample_rate.md b/GB_set_sample_rate.md
index baadfc7..6de1c41 100644
--- a/GB_set_sample_rate.md
+++ b/GB_set_sample_rate.md
@@ -18,6 +18,10 @@ In `apu.h`
 
 `GB_set_sample_rate` must not be called if the instance is being run in another thread, but may be called from the current one (via a callback).
 
+## Notes
+
+The default sample rate is `0`, which disables audio rendering.
+
 ## See Also
 
 * [[GB_apu_set_sample_callback]]