diff --git a/Cargo.toml b/Cargo.toml
index 04c4a83..187135b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ name = "hd-wallet"
 version = "0.5.0"
 edition = "2021"
 license = "MIT OR Apache-2.0"
-description = "HD deteministic wallets derivation"
+description = "HD wallets derivation"
 repository = "https://github.com/dfns/slip-10"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/src/lib.rs b/src/lib.rs
index 6ac3815..4dfebc6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -320,8 +320,6 @@ impl<'de, E: Curve> serde::Deserialize<'de> for ExtendedKeyPair<E> {
 pub trait HdWallet<E: Curve>: DeriveShift<E> {
     /// Derives child extended public key from parent extended public key
     ///
-    /// Returns error if child key is not defined for given child index
-    ///
     /// ### Example
     /// Derive a master public key m/1
     /// ```rust
@@ -346,8 +344,6 @@ pub trait HdWallet<E: Curve>: DeriveShift<E> {
 
     /// Derives child key pair (extended secret key + public key) from parent key pair
     ///
-    /// Returns error if child key is not defined for given child index
-    ///
     /// ### Example
     /// Derive child key m/1<sub>H</sub> from master key
     /// ```rust
@@ -389,8 +385,7 @@ pub trait HdWallet<E: Curve>: DeriveShift<E> {
     /// yields an error, it's propagated to the caller.
     ///
     /// Returns:
-    /// * `Ok(Ok(child_key_pair))` if derivation was successful
-    /// * `Ok(Err(derive_err))` if child key is not defined for given path
+    /// * `Ok(child_key_pair)` if derivation was successful
     /// * `Err(index_err)` if path contained `Err(index_err)`
     ///
     /// ### Example
@@ -426,8 +421,6 @@ pub trait HdWallet<E: Curve>: DeriveShift<E> {
     ///
     /// If derivation path is empty, `parent_key` is returned
     ///
-    /// Returns error if child key is not defined for given child index
-    ///
     /// ### Example
     /// Derive a child key with path m/1/10/1<sub>H</sub>
     /// ```rust
@@ -462,8 +455,7 @@ pub trait HdWallet<E: Curve>: DeriveShift<E> {
     /// yields an error, it's propagated to the caller.
     ///
     /// Returns:
-    /// * `Ok(Ok(child_pk))` if derivation was successful
-    /// * `Ok(Err(derive_err))` if child key is not defined for given path
+    /// * `Ok(child_pk)` if derivation was successful
     /// * `Err(index_err)` if path contained `Err(index_err)`
     ///
     /// ### Example
@@ -499,8 +491,6 @@ pub trait HdWallet<E: Curve>: DeriveShift<E> {
     ///
     /// If derivation path is empty, `parent_public_key` is returned
     ///
-    /// Returns error if child key is not defined for given child index
-    ///
     /// ### Example
     /// Derive a child key with path m/1/10
     /// ```rust