diff --git a/codegen/src/api/mod.rs b/codegen/src/api/mod.rs
index 7a8e8eee2f..7302501e5f 100644
--- a/codegen/src/api/mod.rs
+++ b/codegen/src/api/mod.rs
@@ -253,7 +253,7 @@ impl RuntimeGenerator {
                 // Runtime APIs in the metadata by name.
                 pub static RUNTIME_APIS: [&str; #runtime_api_names_len] = [ #(#runtime_api_names,)* ];
 
-                /// The error type returned when there is a runtime issue.
+                /// The error type is returned when there is a runtime issue.
                 pub type DispatchError = #types_mod_ident::sp_runtime::DispatchError;
 
                 /// The outer event enum.
diff --git a/core/src/blocks/extrinsics.rs b/core/src/blocks/extrinsics.rs
index 0af853fc8b..b8afeca47d 100644
--- a/core/src/blocks/extrinsics.rs
+++ b/core/src/blocks/extrinsics.rs
@@ -691,7 +691,7 @@ mod tests {
             .expect("Valid dynamic parameters are provided");
 
         // Note: `create_unsigned` produces the extrinsic bytes by prefixing the extrinsic length.
-        // The length is handled deserializing `ChainBlockExtrinsic`, therefore the first byte is not needed.
+        // The length is handled by deserializing `ChainBlockExtrinsic`, therefore the first byte is not needed.
         let extrinsic = ExtrinsicDetails::<SubstrateConfig>::decode_from(
             1,
             tx_encoded.encoded(),
diff --git a/core/src/custom_values/address.rs b/core/src/custom_values/address.rs
index 73100dde56..6bbacaed68 100644
--- a/core/src/custom_values/address.rs
+++ b/core/src/custom_values/address.rs
@@ -11,7 +11,7 @@ use derive_where::derive_where;
 /// Use this with [`Address::IsDecodable`].
 pub use crate::utils::Yes;
 
-/// This represents the address of a custom value in in the metadata.
+/// This represents the address of a custom value in the metadata.
 /// Anything that implements it can be used to fetch custom values from the metadata.
 /// The trait is implemented by [`str`] for dynamic lookup and [`StaticAddress`] for static queries.
 pub trait Address {