added a footnote for #1471

base/ltmarks.dtx

@@ -17,7 +17,7 @@
 %<*driver>
 % \fi
 \ProvidesFile{ltmarks.dtx}
-             [2024/07/08 v1.0g LaTeX Kernel (Marks)]
+             [2024/10/22 v1.0g LaTeX Kernel (Marks)]
 % \iffalse
 %
 \documentclass{l3doc}
@@ -676,7 +676,8 @@
 %    and adds suitable \cs{mark_insert:nn} in the two token
 %    lists. These token lists can then be executed at the right place
 %    to reinsert the marks, e.g., directly after the box. This is, for
-%    example, used by \pkg{multicol} when a short balanced
+%    example, going to be used\footnote{Probably not before 2025, though.}
+%    by \pkg{multicol} when a short balanced
 %    \env{multicols} is returned to the galley for typesetting.
 %
 %    If the \meta{source} consists of a single vertical box (plus