---
 texk/web2c/man/etex.man |   14 ++++++++++++++
 texk/web2c/man/tex.man  |    8 ++++++++
 2 files changed, 22 insertions(+)

--- texlive-bin-2026.20260303.78225+ds.orig/texk/web2c/man/etex.man
+++ texlive-bin-2026.20260303.78225+ds/texk/web2c/man/etex.man
@@ -51,6 +51,20 @@
 .SH ENVIRONMENT
 See
 .BR tex (1).
+.TP
+.B SOURCE_DATE_EPOCH
+If set, its value, taken to be in epoch-seconds, will be used for the
+timestamps in the PDF output, such as the CreationDate and ModDate keys.
+This is useful for making reproducible builds.
+.TP
+.B FORCE_SOURCE_DATE
+If set to the value "1", the time-related \*(TX primitives
+.RI ( \eyear ,
+.IR \emonth ,
+.IR \eday ,
+.IR \etime )
+are also initialized from the value of SOURCE_DATE_EPOCH.  This is not
+recommended if there is any viable alternative.
 .\"=====================================================================
 .SH BUGS
 See
--- texlive-bin-2026.20260303.78225+ds.orig/texk/web2c/man/tex.man
+++ texlive-bin-2026.20260303.78225+ds/texk/web2c/man/tex.man
@@ -504,6 +504,14 @@
 Command template for switching to editor (see above).  The default, usually
 .BR vi ,
 is set when \*(TX is compiled.
+.P
+Notes for Debian developers: please keep in mind, that this version of
+the \*(TX interpreter ignores the
+.B SOURCE_DATE_EPOCH
+variable. Instead the current timestamp is written into the
+.I DVI
+file. If you need a reproducible time stamp, please use any engine based
+on pdf\*(TX, e.g., etex, pdftex, latex, pdflatex.
 .\"=====================================================================
 .SH FILES
 The locations of the files mentioned below varies from system to
