diff --git a/bridges/bin/runtime-common/src/messages.rs b/bridges/bin/runtime-common/src/messages.rs
index 7c9bb685ae..b34cbb8554 100644
--- a/bridges/bin/runtime-common/src/messages.rs
+++ b/bridges/bin/runtime-common/src/messages.rs
@@ -156,16 +156,24 @@ pub trait BridgedChainWithMessages: ChainWithMessages {
 	fn transaction_payment(transaction: MessageTransaction<WeightOf<Self>>) -> BalanceOf<Self>;
 }
 
-pub(crate) type ThisChain<B> = <B as MessageBridge>::ThisChain;
-pub(crate) type BridgedChain<B> = <B as MessageBridge>::BridgedChain;
-pub(crate) type HashOf<C> = <C as ChainWithMessages>::Hash;
-pub(crate) type AccountIdOf<C> = <C as ChainWithMessages>::AccountId;
-pub(crate) type SignerOf<C> = <C as ChainWithMessages>::Signer;
-pub(crate) type SignatureOf<C> = <C as ChainWithMessages>::Signature;
-pub(crate) type WeightOf<C> = <C as ChainWithMessages>::Weight;
-pub(crate) type BalanceOf<C> = <C as ChainWithMessages>::Balance;
-
-pub(crate) type CallOf<C> = <C as ThisChainWithMessages>::Call;
+/// This chain in context of message bridge.
+pub type ThisChain<B> = <B as MessageBridge>::ThisChain;
+/// Bridged chain in context of message bridge.
+pub type BridgedChain<B> = <B as MessageBridge>::BridgedChain;
+/// Hash used on the chain.
+pub type HashOf<C> = <C as ChainWithMessages>::Hash;
+/// Account id used on the chain.
+pub type AccountIdOf<C> = <C as ChainWithMessages>::AccountId;
+/// Public key of the chain account that may be used to verify signature.
+pub type SignerOf<C> = <C as ChainWithMessages>::Signer;
+/// Signature type used on the chain.
+pub type SignatureOf<C> = <C as ChainWithMessages>::Signature;
+/// Type of weight that used on the chain.
+pub type WeightOf<C> = <C as ChainWithMessages>::Weight;
+/// Type of balances that is used on the chain.
+pub type BalanceOf<C> = <C as ChainWithMessages>::Balance;
+/// Type of call that is used on this chain.
+pub type CallOf<C> = <C as ThisChainWithMessages>::Call;
 
 /// Raw storage proof type (just raw trie nodes).
 type RawStorageProof = Vec<Vec<u8>>;
@@ -260,12 +268,15 @@ pub mod source {
 	#[derive(RuntimeDebug)]
 	pub struct FromThisChainMessageVerifier<B>(PhantomData<B>);
 
-	pub(crate) const OUTBOUND_LANE_DISABLED: &str = "The outbound message lane is disabled.";
-	pub(crate) const TOO_MANY_PENDING_MESSAGES: &str = "Too many pending messages at the lane.";
-	pub(crate) const BAD_ORIGIN: &str =
-		"Unable to match the source origin to expected target origin.";
-	pub(crate) const TOO_LOW_FEE: &str =
-		"Provided fee is below minimal threshold required by the lane.";
+	/// The error message returned from LaneMessageVerifier when outbound lane is disabled.
+	pub const OUTBOUND_LANE_DISABLED: &str = "The outbound message lane is disabled.";
+	/// The error message returned from LaneMessageVerifier when too many pending messages at the
+	/// lane.
+	pub const TOO_MANY_PENDING_MESSAGES: &str = "Too many pending messages at the lane.";
+	/// The error message returned from LaneMessageVerifier when call origin is mismatch.
+	pub const BAD_ORIGIN: &str = "Unable to match the source origin to expected target origin.";
+	/// The error message returned from LaneMessageVerifier when the message fee is too low.
+	pub const TOO_LOW_FEE: &str = "Provided fee is below minimal threshold required by the lane.";
 
 	impl<B>
 		LaneMessageVerifier<
diff --git a/bridges/relays/utils/src/error.rs b/bridges/relays/utils/src/error.rs
index 2e4128feb0..26f1d0cace 100644
--- a/bridges/relays/utils/src/error.rs
+++ b/bridges/relays/utils/src/error.rs
@@ -26,7 +26,7 @@ pub enum Error {
 	/// Failed to parse the response from HTTP service.
 	#[error("Failed to parse HTTP service response: {0:?}. Response: {1:?}")]
 	ParseHttp(serde_json::Error, String),
-	/// Failed to select response value from the JSON response.
+	/// Failed to select response value from the Json response.
 	#[error("Failed to select value from response: {0:?}. Response: {1:?}")]
 	SelectResponseValue(jsonpath_lib::JsonPathError, String),
 	/// Failed to parse float value from the selected value.