diff --git a/zebra-chain/src/primitives/redpallas/scalar_mul.rs b/zebra-chain/src/primitives/redpallas/scalar_mul.rs
index 295a4388..88581cdf 100644
--- a/zebra-chain/src/primitives/redpallas/scalar_mul.rs
+++ b/zebra-chain/src/primitives/redpallas/scalar_mul.rs
@@ -67,7 +67,9 @@ pub trait VartimeMultiscalarMul {
 impl NonAdjacentForm for pallas::Scalar {
     /// Compute a width-\\(w\\) "Non-Adjacent Form" of this scalar.
     ///
-    /// Thanks to curve25519-dalek
+    /// Thanks to [`curve25519-dalek`].
+    ///
+    /// [`curve25519-dalek`]: https://github.com/dalek-cryptography/curve25519-dalek/blob/3e189820da03cc034f5fa143fc7b2ccb21fffa5e/src/scalar.rs#L907
     fn non_adjacent_form(&self, w: usize) -> [i8; 256] {
         // required by the NAF definition
         debug_assert!(w >= 2);