diff --git a/doc/apiref.rst b/doc/apiref.rst
index b429d0b..f1a7e16 100644
--- a/doc/apiref.rst
+++ b/doc/apiref.rst
@@ -966,10 +966,14 @@ in which case no error information is returned to the caller.
 
        Array index is out of range.
 
+   .. versionadded:: 2.11
+
 .. function:: enum json_error_code json_error_code(const json_error_t *error)
 
    Returns the error code embedded in ``error->text``.
 
+   .. versionadded:: 2.11
+
 
 Encoding
 ========