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diff --git a/systems/doc/luatex/luatex-callbacks.tex b/systems/doc/luatex/luatex-callbacks.tex
index 6bacfe7f05..22638f759b 100644
--- a/systems/doc/luatex/luatex-callbacks.tex
+++ b/systems/doc/luatex/luatex-callbacks.tex
@@ -240,7 +240,7 @@ of a valid file by your operating system.
\stopsection
-\startsection[iocallback][title={File reading callbacks}]
+\startsection[reference=iocallback,title={File reading callbacks}]
The behavior documented in this subsection is considered stable in the sense that
there will not be backward-incompatible changes any more.