diff --git a/examples/matching-engine/tests/transaction.rs b/examples/matching-engine/tests/transaction.rs
index 2a33f64cdd28..7c94c98778c0 100644
--- a/examples/matching-engine/tests/transaction.rs
+++ b/examples/matching-engine/tests/transaction.rs
@@ -49,11 +49,11 @@ pub async fn get_orders(
 ///   * user_a with 10 tokens A.
 ///   * user_b with 9 tokens B.
 /// * Then we create the following orders:
-///   * User_a: Offer to buy token B in exchange of token A for a price of 1 (or 2) with
+///   * User_a: Offer to buy token B in exchange for token A for a price of 1 (or 2) with
 ///     a quantity of 3 token B.
 ///     User_a thus commits 3 * 1 + 3 * 2 = 9 token A to the matching engine chain and is
 ///     left with 1 token A on chain A
-///   * User_b: Offer to sell token B in exchange of token A for a price of 2 (or 4) with
+///   * User_b: Offer to sell token B in exchange for token A for a price of 2 (or 4) with
 ///     a quantity of 4 token B
 ///     User_b thus commits 4 + 4 = 8 token B on the matching engine chain and is left
 ///     with 1 token B.
diff --git a/linera-execution/src/lib.rs b/linera-execution/src/lib.rs
index 8a9fc7a79c9e..19415870e239 100644
--- a/linera-execution/src/lib.rs
+++ b/linera-execution/src/lib.rs
@@ -1400,6 +1400,6 @@ pub struct InvalidWasmRuntime(String);
 doc_scalar!(Operation, "An operation to be executed in a block");
 doc_scalar!(
     Message,
-    "An message to be sent and possibly executed in the receiver's block."
+    "A message to be sent and possibly executed in the receiver's block."
 );
 doc_scalar!(MessageKind, "The kind of outgoing message being sent");
diff --git a/linera-service-graphql-client/gql/service_schema.graphql b/linera-service-graphql-client/gql/service_schema.graphql
index 396e588a2666..7ef998e0ea23 100644
--- a/linera-service-graphql-client/gql/service_schema.graphql
+++ b/linera-service-graphql-client/gql/service_schema.graphql
@@ -675,7 +675,7 @@ type MapView_BlobId_Blob_9f0b41f3 {
 }
 
 """
-An message to be sent and possibly executed in the receiver's block.
+A message to be sent and possibly executed in the receiver's block.
 """
 scalar Message