diff --git a/src/bytes.rs b/src/bytes.rs
index d188eb69b..1f1ee8c05 100644
--- a/src/bytes.rs
+++ b/src/bytes.rs
@@ -92,7 +92,10 @@ pub type Bytes = Vec<u8>;
 
 /// Slice of bytes to underlying memory
 pub trait BytesConvertable {
+	// TODO: rename to as_slice
 	fn bytes(&self) -> &[u8];
+	fn as_slice(&self) -> &[u8] { self.bytes() }
+	fn to_bytes(&self) -> Bytes { self.as_slice().to_vec() }
 }
 
 impl<'a> BytesConvertable for &'a [u8] {
diff --git a/src/error.rs b/src/error.rs
index 71514d045..329e826bd 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -13,6 +13,7 @@ pub enum EthcoreError {
 	FromHex(FromHexError),
 	BaseData(BaseDataError),
 	BadSize,
+	UnknownName,
 }
 
 impl From<FromHexError> for EthcoreError {
diff --git a/src/semantic_version.rs b/src/semantic_version.rs
index 026902263..4fefaf86a 100644
--- a/src/semantic_version.rs
+++ b/src/semantic_version.rs
@@ -2,8 +2,8 @@
 /// 
 /// # Example
 /// ```
-/// extern crate ethcore;
-/// use ethcore::engine::*;
+/// extern crate ethcore_util;
+/// use ethcore_util::semantic_version::*;
 /// fn main() {
 ///   assert_eq!(SemanticVersion::new(1, 2, 3).as_u32(), 0x010203);
 /// }