diff --git a/units/src/fee.rs b/units/src/fee.rs
index 76aa55309..008fd920b 100644
--- a/units/src/fee.rs
+++ b/units/src/fee.rs
@@ -10,6 +10,18 @@
 //!
 //! We provide `fee.checked_div_by_weight_ceil(weight)` to calculate a minimum threshold fee rate
 //! required to pay at least `fee` for transaction with `weight`.
+//!
+//! We support various `core::ops` traits all of which return [`NumOpResult<T>`].
+//!
+//! For specific methods see:
+//!
+//! * [`Amount::checked_div_by_weight_floor`]
+//! * [`Amount::checked_div_by_weight_ceil`]
+//! * [`Amount::checked_div_by_fee_rate_floor`]
+//! * [`Amount::checked_div_by_fee_rate_ceil`]
+//! * [`Weight::checked_mul_by_fee_rate`]
+//! * [`FeeRate::checked_mul_by_weight`]
+//! * [`FeeRate::to_fee`]
 
 use core::ops;
 
diff --git a/units/src/lib.rs b/units/src/lib.rs
index 643120223..12c818650 100644
--- a/units/src/lib.rs
+++ b/units/src/lib.rs
@@ -34,7 +34,6 @@ extern crate alloc;
 #[cfg(feature = "std")]
 extern crate std;
 
-mod fee;
 mod internal_macros;
 mod result;
 
@@ -48,6 +47,7 @@ pub mod _export {
 
 pub mod amount;
 pub mod block;
+pub mod fee;
 pub mod fee_rate;
 pub mod locktime;
 pub mod parse;