diff --git a/doc/src/Run_options.rst b/doc/src/Run_options.rst
index f7bb652ea9..73fc37183e 100644
--- a/doc/src/Run_options.rst
+++ b/doc/src/Run_options.rst
@@ -262,6 +262,8 @@ Disable generating a citation reminder (see above) at all.
 
 **-nonbuf**
 
+.. versionadded:: 15Sep2022
+
 Turn off buffering for screen and logfile output.  For performance
 reasons, output to the screen and logfile is usually buffered, i.e.
 output is only written to a file if its buffer - typically 4096 bytes -