diff --git a/doc/changelog.d/647.documentation.md b/doc/changelog.d/647.documentation.md
new file mode 100644
index 00000000..d4c85644
--- /dev/null
+++ b/doc/changelog.d/647.documentation.md
@@ -0,0 +1 @@
+Add versionadded directives for new functionality
\ No newline at end of file
diff --git a/src/ansys/openapi/common/_session.py b/src/ansys/openapi/common/_session.py
index 9a0efaea..1d6217e7 100644
--- a/src/ansys/openapi/common/_session.py
+++ b/src/ansys/openapi/common/_session.py
@@ -85,6 +85,8 @@ class AuthenticationScheme(Enum):
     """Authentication scheme.
 
     Used to specify an authentication scheme used when connecting to the server with credentials.
+
+    .. versionadded:: 2.1
     """
 
     AUTO = "auto"
@@ -234,6 +236,8 @@ def with_credentials(
             authentication scheme. Valid schemes for this method are :attr:`~.AuthenticationScheme.BASIC` or
             :attr:`~.AuthenticationScheme.NTLM`.
 
+            .. versionadded:: 2.1
+
         Returns
         -------
         :class:`~ansys.openapi.common.ApiClientFactory`