diff --git a/README.md b/README.md
index 96b47d7..d1140b0 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ born from the need to create dynamically object trees from nested dictionaries
 - Use dictionaries to create objects from the factory
 - Create `attrs`-compatible converters to automatically convert dictionaries to
   instances of registered types
-- Customise factories to your needs
+- Customize factories to your needs
 
 Check the [documentation](https://dessinemoi.readthedocs.io) for more detail.
 
diff --git a/src/dessinemoi/_core.py b/src/dessinemoi/_core.py
index 769dbc5..21c8175 100644
--- a/src/dessinemoi/_core.py
+++ b/src/dessinemoi/_core.py
@@ -74,7 +74,7 @@ def fullname(self):
     @classmethod
     def from_str(cls, value: str) -> LazyType:
         """
-        Initialise a :class:`LazyType` from a string representing its fully
+        Initialize a :class:`LazyType` from a string representing its fully
         qualified name.
 
         :param value: