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-rw-r--r--Master/texmf-dist/doc/latex/l3kernel/source3body.tex10
1 files changed, 9 insertions, 1 deletions
diff --git a/Master/texmf-dist/doc/latex/l3kernel/source3body.tex b/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
index cddbdac6e2a..34573d3d648 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
@@ -44,8 +44,16 @@ for those people who are interested.
\setlength\parskip{\baselineskip}
\noindent
+\ifinterface
This is the reference documentation for the \pkg{expl3}
-programming environment. The \pkg{expl3} modules set up an experimental
+programming environment; see the matching \pkg{source3} PDF
+for the typeset sources.
+\else
+This is the typset sources for the \pkg{expl3}
+programming environment; see the matching \pkg{interface3} PDF
+for the API reference manual.
+\fi
+The \pkg{expl3} modules set up a
naming scheme for \LaTeX{} commands, which allow the \LaTeX{} programmer
to systematically name functions and variables, and specify the argument
types of functions.