diff --git a/README.md b/README.md
index 970ec551..224354be 100644
--- a/README.md
+++ b/README.md
@@ -58,13 +58,13 @@ let ciphertext = hex!("e405626e 4f1236b3 670ee428 332ea20e");
 // Here we use the `Into` trait to convert arrays into it.
 let mut cipher = ChaCha20::new(&key.into(), &nonce.into());
 
-let mut buffer = plaintext.clone();
+let mut buffer = plaintext;
 
 // apply keystream (encrypt)
 cipher.apply_keystream(&mut buffer);
 assert_eq!(buffer, ciphertext);
 
-let ciphertext = buffer.clone();
+let ciphertext = buffer;
 
 // ChaCha ciphers support seeking
 cipher.seek(0u32);
diff --git a/chacha20/src/lib.rs b/chacha20/src/lib.rs
index a086a01b..f3e47ae0 100644
--- a/chacha20/src/lib.rs
+++ b/chacha20/src/lib.rs
@@ -40,13 +40,13 @@
 //! // Here we use the `Into` trait to convert arrays into it.
 //! let mut cipher = ChaCha20::new(&key.into(), &nonce.into());
 //!
-//! let mut buffer = plaintext.clone();
+//! let mut buffer = plaintext;
 //!
 //! // apply keystream (encrypt)
 //! cipher.apply_keystream(&mut buffer);
 //! assert_eq!(buffer, ciphertext);
 //!
-//! let ciphertext = buffer.clone();
+//! let ciphertext = buffer;
 //!
 //! // ChaCha ciphers support seeking
 //! cipher.seek(0u32);
diff --git a/hc-256/src/lib.rs b/hc-256/src/lib.rs
index fb85ae26..2365a90e 100644
--- a/hc-256/src/lib.rs
+++ b/hc-256/src/lib.rs
@@ -25,13 +25,13 @@
 //! // Here we use the `Into` trait to convert arrays into it.
 //! let mut cipher = Hc256::new(&key.into(), &nonce.into());
 //!
-//! let mut buffer = plaintext.clone();
+//! let mut buffer = plaintext;
 //!
 //! // apply keystream (encrypt)
 //! cipher.apply_keystream(&mut buffer);
 //! assert_eq!(buffer, ciphertext);
 //!
-//! let ciphertext = buffer.clone();
+//! let ciphertext = buffer;
 //!
 //! // decrypt ciphertext by applying keystream again
 //! let mut cipher = Hc256::new(&key.into(), &nonce.into());
diff --git a/rabbit/src/lib.rs b/rabbit/src/lib.rs
index 677b7ac4..c92fe04b 100644
--- a/rabbit/src/lib.rs
+++ b/rabbit/src/lib.rs
@@ -25,13 +25,13 @@
 //! // Here we use the `Into` trait to convert arrays into it.
 //! let mut cipher = Rabbit::new(&key.into(), &nonce.into());
 //!
-//! let mut buffer = plaintext.clone();
+//! let mut buffer = plaintext;
 //!
 //! // apply keystream (encrypt)
 //! cipher.apply_keystream(&mut buffer);
 //! assert_eq!(buffer, ciphertext);
 //!
-//! let ciphertext = buffer.clone();
+//! let ciphertext = buffer;
 //!
 //! // decrypt ciphertext by applying keystream again
 //! let mut cipher = Rabbit::new(&key.into(), &nonce.into());
diff --git a/salsa20/src/lib.rs b/salsa20/src/lib.rs
index a5407c73..856afc82 100644
--- a/salsa20/src/lib.rs
+++ b/salsa20/src/lib.rs
@@ -38,13 +38,13 @@
 //! // Here we use the `Into` trait to convert arrays into it.
 //! let mut cipher = Salsa20::new(&key.into(), &nonce.into());
 //!
-//! let mut buffer = plaintext.clone();
+//! let mut buffer = plaintext;
 //!
 //! // apply keystream (encrypt)
 //! cipher.apply_keystream(&mut buffer);
 //! assert_eq!(buffer, ciphertext);
 //!
-//! let ciphertext = buffer.clone();
+//! let ciphertext = buffer;
 //!
 //! // Salsa ciphers support seeking
 //! cipher.seek(0u32);