diff --git a/Documentation/pycardium/os.rst b/Documentation/pycardium/os.rst
index e7e174ca3dc7b27dad5746f6bce86782b76f6bc8..ce71c1b476921a81435393fc0383ff7070c51a30 100644
--- a/Documentation/pycardium/os.rst
+++ b/Documentation/pycardium/os.rst
@@ -26,6 +26,8 @@ CPython-Like
 
    Return ``n`` random bytes.
 
+   .. versionadded:: 1.3
+
    :param int n: Number of random bytes to retrieve.
    :returns: ``bytes()`` object with ``n`` random bytes.