diff --git a/l3kernel/l3sys.dtx b/l3kernel/l3sys.dtx
index 941793689d..6e5168e574 100644
--- a/l3kernel/l3sys.dtx
+++ b/l3kernel/l3sys.dtx
@@ -105,13 +105,13 @@
 %   |luatex|, |pdftex|, |ptex|, |uptex| or |xetex|.
 % \end{variable}
 %
-% \begin{variable}[added = 2020-07-31]{\c_sys_engine_exec_str}
+% \begin{variable}[added = 2020-08-20]{\c_sys_engine_exec_str}
 %   The name of the standard executable for the current \TeX{} engine given
 %   as a lower case string: one of  |luatex|,
 %   |luahbtex|, |pdftex|, |eptex|, |euptex| or |xetex|.
 % \end{variable}
 %
-% \begin{variable}[added = 2020-07-31]{\c_sys_engine_format_str}
+% \begin{variable}[added = 2020-08-20]{\c_sys_engine_format_str}
 %   The name of the preloaded format for the current \TeX{} run given
 %   as a lower case string: one of
 %   |lualatex|, |pdflatex| (or |latex|), |platex|, |uplatex| or |xelatex|.