diff --git a/bedspec/_reader.py b/bedspec/_reader.py
index 14d7b71..c8d48b4 100644
--- a/bedspec/_reader.py
+++ b/bedspec/_reader.py
@@ -40,6 +40,7 @@ def comment_prefixes(self) -> set[str]:
 
     @staticmethod
     def _build_union(*types: type) -> type | UnionType:
+        """Build a singular type or a union type if multiple types are provided."""
         if len(types) == 1:
             return types[0]
         union: UnionType | type = types[0]
diff --git a/bedspec/_writer.py b/bedspec/_writer.py
index 848c312..817a1ea 100644
--- a/bedspec/_writer.py
+++ b/bedspec/_writer.py
@@ -13,7 +13,7 @@ class BedWriter(TsvStructWriter[BedType]):
 
     @override
     def _encode(self, item: Any) -> Any:
-        """A callback for over_readriding the encoding of builtin types and custom types."""
+        """A callback for overriding the encoding of builtin types and custom types."""
         if item is None:
             return "."
         if isinstance(item, (list, set, tuple)):