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-rw-r--r--macros/latex/contrib/l3kernel/source3body.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/macros/latex/contrib/l3kernel/source3body.tex b/macros/latex/contrib/l3kernel/source3body.tex
index a2e87856bd..20e1875361 100644
--- a/macros/latex/contrib/l3kernel/source3body.tex
+++ b/macros/latex/contrib/l3kernel/source3body.tex
@@ -207,7 +207,9 @@ following argument specifiers:
\item[\texttt{c}] This means \emph{csname}, and indicates that the
argument will be turned into a csname before being used. So
|\foo:c| |{ArgumentOne}| will act in the same way as |\foo:N|
- |\ArgumentOne|.
+ |\ArgumentOne|. All macros that appear in the argument are expanded.
+ An internal error will occur if the result of expansion inside
+ a \texttt{c}-type argument is not a series of character tokens.
\item[\texttt{V} and \texttt{v}] These mean \emph{value
of variable}. The \texttt{V} and \texttt{v} specifiers are used to
get the content of a variable without needing to worry about the