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diff --git a/systems/doc/luatex/luatex-nodes.tex b/systems/doc/luatex/luatex-nodes.tex
index 5a48b4c18a..d18006df0c 100644
--- a/systems/doc/luatex/luatex-nodes.tex
+++ b/systems/doc/luatex/luatex-nodes.tex
@@ -890,6 +890,10 @@ The difference between \type {data} and \type {string} is that on assignment, th
\type {data} field is converted to a token list, cf.\ use as \lpr {latelua}. The
\type {string} version is treated as a literal string.
+When a function is used, it gets called with as first argument the node that triggers
+the call.
+
+
\stopsection
\startsection[title={\DVI\ backend whatsits}]