diff --git a/docs/usage/api.rst b/docs/usage/api.rst
index 8e8ca90..62256f1 100644
--- a/docs/usage/api.rst
+++ b/docs/usage/api.rst
@@ -15,9 +15,9 @@ API overview
     :param flags: (optional). defaults to ``0``
     :param dont_inherit: (optional). defaults to ``False``
     :param policy: (optional). defaults to ``RestrictingNodeTransformer``
-    :type source: str or unicode text or ``ast.AST``
-    :type filename: str or unicode text
-    :type mode: str or unicode text
+    :type source: str or ``ast.Module``
+    :type filename: str or bytes or os.PathLike[typing.Any]
+    :type mode: str
     :type flags: int
     :type dont_inherit: int
     :type policy: RestrictingNodeTransformer class