diff --git a/Cargo.toml b/Cargo.toml
index 2d17e05..98a636c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,6 +19,7 @@ rand = { version = "0.8", default-features = false, features = ["small_rng"] }
 
 [features]
 # Derives the `Serialize` and `Deserialize` traits from [`serde`](https://crates.io/crates/serde) for the `Primes` struct, as well as a few others.
+# Uses the [`serde_arrays`](https://crates.io/crates/serde_arrays) crate to do this, and that crate uses the standard library.
 serde = ["dep:serde", "dep:serde_arrays"]
 
 [package.metadata.docs.rs]
diff --git a/README.md b/README.md
index 863b410..8eeb7dc 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,8 @@ and more!
 
 `serde`: derives the `Serialize` and `Deserialize` traits from [`serde`](https://crates.io/crates/serde)
 for the `Primes` struct, as well as a few others.
+Uses the [`serde_arrays`](https://crates.io/crates/serde_arrays)
+crate to do this, and that crate uses the standard library.
 
 ## License
 
diff --git a/src/lib.rs b/src/lib.rs
index 2f713ac..29522dd 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -106,6 +106,7 @@
 //! # Features
 //!
 //! `serde`: derives the [`Serialize`](serde::Serialize) and [`Deserialize`](serde::Deserialize) traits from [`serde`](https://docs.rs/serde/latest/serde/) for the [`Primes`] struct, as well as a few others.
+//! Uses the [`serde_arrays`](https://docs.rs/serde_arrays/0.1.0) crate to do this, and that crate uses the standard library.
 
 #![forbid(unsafe_code)]
 #![no_std]