diff --git a/ariadne_codegen/contrib/client_forward_refs.py b/ariadne_codegen/contrib/client_forward_refs.py
index 009d84a2..49020133 100644
--- a/ariadne_codegen/contrib/client_forward_refs.py
+++ b/ariadne_codegen/contrib/client_forward_refs.py
@@ -271,7 +271,7 @@ def _update_imports(self, module: ast.Module) -> None:
         return_types_not_used_as_input = set(self.input_and_return_types)
 
         # The ones we import in the method don't need to be imported at all -
-        # unless that's the type we return. This behaviour can differ if you use
+        # unless that's the type we return. This behavior can differ if you use
         # a plugin such as `ShorterResultsPlugin` that will import a type that
         # is different from the type returned.
         return_types_not_used_as_input |= (
diff --git a/tests/main/graphql_schemas/all_types/expected_schema.py b/tests/main/graphql_schemas/all_types/expected_schema.py
index cccf8a03..75668117 100644
--- a/tests/main/graphql_schemas/all_types/expected_schema.py
+++ b/tests/main/graphql_schemas/all_types/expected_schema.py
@@ -214,14 +214,14 @@
         ),
         GraphQLDirective(
             name="specifiedBy",
-            description="Exposes a URL that specifies the behaviour of this scalar.",
+            description="Exposes a URL that specifies the behavior of this scalar.",
             is_repeatable=False,
             locations=(DirectiveLocation.SCALAR,),
             args={
                 "url": GraphQLArgument(
                     GraphQLNonNull(GraphQLString),
                     default_value=Undefined,
-                    description="The URL that specifies the behaviour of this scalar.",
+                    description="The URL that specifies the behavior of this scalar.",
                     deprecation_reason=None,
                 )
             },
diff --git a/tests/main/graphql_schemas/example/expected_schema.py b/tests/main/graphql_schemas/example/expected_schema.py
index 53cab3c4..3642ad83 100644
--- a/tests/main/graphql_schemas/example/expected_schema.py
+++ b/tests/main/graphql_schemas/example/expected_schema.py
@@ -355,14 +355,14 @@
         ),
         GraphQLDirective(
             name="specifiedBy",
-            description="Exposes a URL that specifies the behaviour of this scalar.",
+            description="Exposes a URL that specifies the behavior of this scalar.",
             is_repeatable=False,
             locations=(DirectiveLocation.SCALAR,),
             args={
                 "url": GraphQLArgument(
                     GraphQLNonNull(GraphQLString),
                     default_value=Undefined,
-                    description="The URL that specifies the behaviour of this scalar.",
+                    description="The URL that specifies the behavior of this scalar.",
                     deprecation_reason=None,
                 )
             },