diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index d33f5320845..5669e35b896 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -281,6 +281,8 @@ always available.
 
       The information in the table is simplified.
 
+   .. versionadded:: 2.6
+
 
 .. function:: getcheckinterval()