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diff --git a/Master/texmf-dist/doc/luatex/base/luatex-tex.tex b/Master/texmf-dist/doc/luatex/base/luatex-tex.tex
index 894227661ba..48bdeef119c 100644
--- a/Master/texmf-dist/doc/luatex/base/luatex-tex.tex
+++ b/Master/texmf-dist/doc/luatex/base/luatex-tex.tex
@@ -2504,6 +2504,23 @@ return values.
\stopsubsection
+\startsubsection[title={\type {record_input_file} and \type {record_output_file}}]
+
+\topicindex {files+recording}
+
+\libindex{record_input_file}
+\libindex{record_output_file}
+
+These two function can be used to register used files. Because callbacks can load
+files themselves you might need these helpers (if you use recording at all).
+
+\startfunctioncall
+kpse.record_input_file(<string> name)
+kpse.record_output_file(<string> name)
+\stopfunctioncall
+
+\stopsubsection
+
\startsubsection[title={\type {find_file}}]
\topicindex {files+finding}