diff --git a/curve25519-dalek/src/backend/serial/mod.rs b/curve25519-dalek/src/backend/serial/mod.rs
index 13fef5c63..4baec838b 100644
--- a/curve25519-dalek/src/backend/serial/mod.rs
+++ b/curve25519-dalek/src/backend/serial/mod.rs
@@ -24,17 +24,21 @@ cfg_if! {
     if #[cfg(curve25519_dalek_backend = "fiat")] {
 
         #[cfg(curve25519_dalek_bits = "32")]
+        #[doc(hidden)]
         pub mod fiat_u32;
 
         #[cfg(curve25519_dalek_bits = "64")]
+        #[doc(hidden)]
         pub mod fiat_u64;
 
     } else {
 
         #[cfg(curve25519_dalek_bits = "32")]
+        #[doc(hidden)]
         pub mod u32;
 
         #[cfg(curve25519_dalek_bits = "64")]
+        #[doc(hidden)]
         pub mod u64;
 
     }