diff --git a/Cargo.lock b/Cargo.lock
index 6a3a8a7..2e707bd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1758,7 +1758,7 @@ dependencies = [
 
 [[package]]
 name = "keyfork-derive-util"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "digest",
  "ed25519-dalek",
diff --git a/crates/derive/keyfork-derive-util/Cargo.toml b/crates/derive/keyfork-derive-util/Cargo.toml
index 4c208cd..ae1d1d6 100644
--- a/crates/derive/keyfork-derive-util/Cargo.toml
+++ b/crates/derive/keyfork-derive-util/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "keyfork-derive-util"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 license = "MIT"
 
diff --git a/crates/derive/keyfork-derive-util/src/extended_key/public_key.rs b/crates/derive/keyfork-derive-util/src/extended_key/public_key.rs
index 2e9d7ba..f366429 100644
--- a/crates/derive/keyfork-derive-util/src/extended_key/public_key.rs
+++ b/crates/derive/keyfork-derive-util/src/extended_key/public_key.rs
@@ -11,8 +11,8 @@ const KEY_SIZE: usize = 256;
 /// Errors associated with creating or deriving Extended Public Keys.
 #[derive(Error, Clone, Debug)]
 pub enum Error {
-    /// BIP-0032 does not support deriving public keys from hardened private keys.
-    #[error("Public keys may not be derived when hardened")]
+    /// BIP-0032 does not support hardened public key derivation from parent public keys.
+    #[error("Hardened child public keys may not be derived from parent public keys")]
     HardenedIndex,
 
     /// The maximum depth for key derivation has been reached. The supported maximum depth is 255.
diff --git a/crates/derive/keyfork-derive-util/src/private_key.rs b/crates/derive/keyfork-derive-util/src/private_key.rs
index edd19d3..b0e9fa9 100644
--- a/crates/derive/keyfork-derive-util/src/private_key.rs
+++ b/crates/derive/keyfork-derive-util/src/private_key.rs
@@ -85,7 +85,7 @@ pub trait PrivateKey: Sized {
     /// # Errors
     ///
     /// An error may be returned if:
-    /// * A nonzero `other` is provided.
+    /// * An all-zero `other` is provided.
     /// * An error specific to the given algorithm was encountered.
     fn derive_child(&self, other: &PrivateKeyBytes) -> Result<Self, Self::Err>;
 
@@ -180,7 +180,6 @@ impl PrivateKey for ed25519_dalek::SigningKey {
 
 use crate::public_key::TestPublicKey;
 
-#[doc(hidden)]
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct TestPrivateKey {
     key: [u8; 32],
diff --git a/crates/derive/keyfork-derive-util/src/public_key.rs b/crates/derive/keyfork-derive-util/src/public_key.rs
index d1ff170..d9c71b1 100644
--- a/crates/derive/keyfork-derive-util/src/public_key.rs
+++ b/crates/derive/keyfork-derive-util/src/public_key.rs
@@ -42,7 +42,7 @@ pub trait PublicKey: Sized {
     /// # Errors
     ///
     /// An error may be returned if:
-    /// * A nonzero `other` is provided.
+    /// * An all-zero `other` is provided.
     /// * An error specific to the given algorithm was encountered.
     fn derive_child(&self, other: PrivateKeyBytes) -> Result<Self, Self::Err>;
 
@@ -142,7 +142,6 @@ impl PublicKey for VerifyingKey {
     }
 }
 
-#[doc(hidden)]
 #[derive(Clone)]
 pub struct TestPublicKey {
     pub(crate) key: [u8; 33],
diff --git a/crates/derive/keyfork-derive-util/src/request.rs b/crates/derive/keyfork-derive-util/src/request.rs
index 42d8b4b..0df421c 100644
--- a/crates/derive/keyfork-derive-util/src/request.rs
+++ b/crates/derive/keyfork-derive-util/src/request.rs
@@ -57,7 +57,7 @@ pub enum DerivationAlgorithm {
     #[allow(missing_docs)]
     Secp256k1,
     #[doc(hidden)]
-    Internal,
+    TestAlgorithm,
 }
 
 impl DerivationAlgorithm {
@@ -86,7 +86,7 @@ impl DerivationAlgorithm {
                     &derived_key,
                 ))
             }
-            Self::Internal => {
+            Self::TestAlgorithm => {
                 let key = ExtendedPrivateKey::<TestPrivateKey>::new(seed);
                 let derived_key = key.derive_path(path)?;
                 Ok(DerivationResponse::with_algo_and_xprv(
@@ -120,7 +120,7 @@ pub trait AsAlgorithm: PrivateKey {
 
 impl AsAlgorithm for TestPrivateKey {
     fn as_algorithm() -> DerivationAlgorithm {
-        DerivationAlgorithm::Internal
+        DerivationAlgorithm::TestAlgorithm
     }
 }
 
@@ -144,7 +144,7 @@ impl DerivationRequest {
     /// # };
     /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
     /// let algo: DerivationAlgorithm = //
-    /// #   DerivationAlgorithm::Internal;
+    /// #   DerivationAlgorithm::TestAlgorithm;
     /// let path: DerivationPath = //
     /// #   DerivationPath::default();
     /// let request = DerivationRequest::new(algo, &path);
@@ -169,7 +169,7 @@ impl DerivationRequest {
     /// # };
     /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
     /// let algo: DerivationAlgorithm = //
-    /// #   DerivationAlgorithm::Internal;
+    /// #   DerivationAlgorithm::TestAlgorithm;
     /// let path: DerivationPath = //
     /// #   DerivationPath::default();
     /// let request = DerivationRequest::new(algo, &path);
@@ -199,7 +199,7 @@ impl DerivationRequest {
     /// #   b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
     /// #   )?;
     /// let algo: DerivationAlgorithm = //
-    /// #   DerivationAlgorithm::Internal;
+    /// #   DerivationAlgorithm::TestAlgorithm;
     /// let path: DerivationPath = //
     /// #   DerivationPath::default();
     /// let request = DerivationRequest::new(algo, &path);
@@ -228,7 +228,7 @@ impl DerivationRequest {
     /// let seed: &[u8; 64] = //
     /// #   b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
     /// let algo: DerivationAlgorithm = //
-    /// #   DerivationAlgorithm::Internal;
+    /// #   DerivationAlgorithm::TestAlgorithm;
     /// let path: DerivationPath = //
     /// #   DerivationPath::default();
     /// let request = DerivationRequest::new(algo, &path);