diff --git a/agb/src/sound/mixer/mod.rs b/agb/src/sound/mixer/mod.rs
index 1ba70488..16ca4cd8 100644
--- a/agb/src/sound/mixer/mod.rs
+++ b/agb/src/sound/mixer/mod.rs
@@ -1,3 +1,5 @@
+#![deny(missing_docs)]
+
 //! # agb mixer
 //!
 //! The agb software mixer allows for high performance playing of background music