diff --git a/protocol/src/types/primitive.rs b/protocol/src/types/primitive.rs
index 84df2acb9..bf2b5b2af 100644
--- a/protocol/src/types/primitive.rs
+++ b/protocol/src/types/primitive.rs
@@ -175,6 +175,11 @@ impl<'de> Deserialize<'de> for Hex {
     }
 }
 
+/// Zeroizing is the process of securely zeroing memory to prevent sensitive
+/// data from being accessed by unauthorized parties.
+///
+/// This ensures that sensitive data is securely erased from memory when it is
+/// no longer needed.
 pub type Key256Bits = Zeroizing<[u8; 32]>;
 
 #[derive(Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]