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diff --git a/Build/source/texk/web2c/hitexdir/tex/ifhint.tex b/Build/source/texk/web2c/hitexdir/tex/ifhint.tex
index 87ae7b4b1c1..b27ed859199 100644
--- a/Build/source/texk/web2c/hitexdir/tex/ifhint.tex
+++ b/Build/source/texk/web2c/hitexdir/tex/ifhint.tex
@@ -1,3 +1,5 @@
+% Public domain. Originally written by Martin Ruckert.
+
\newif\ifhint
% How to test for the HiTeX engine
\expandafter\ifx\csname HINTversion\endcsname\relax