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-rw-r--r--macros/latex/contrib/l3kernel/l3token.dtx6
1 files changed, 5 insertions, 1 deletions
diff --git a/macros/latex/contrib/l3kernel/l3token.dtx b/macros/latex/contrib/l3kernel/l3token.dtx
index fe8d1a780e..a5a225ab8b 100644
--- a/macros/latex/contrib/l3kernel/l3token.dtx
+++ b/macros/latex/contrib/l3kernel/l3token.dtx
@@ -43,7 +43,7 @@
% }^^A
% }
%
-% \date{Released 2024-02-13}
+% \date{Released 2024-02-18}
%
% \maketitle
%
@@ -1005,6 +1005,10 @@
% effect after the loop. Within the code, \cs{l_peek_token} is set
% equal (as a token, not a token list) to the token under
% consideration.
+%
+% Peek functions cannot be used within this mapping function (nor
+% other mapping functions) since the input stream contains trailing
+% material necessary for the functioning of the loop.
% \begin{texnote}
% In case the input stream has not yet been tokenized (converted
% from characters to tokens), characters are tokenized one by one as