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-rw-r--r--macros/plain/graphics/psfrag.tex3
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diff --git a/macros/plain/graphics/psfrag.tex b/macros/plain/graphics/psfrag.tex
index 27475c473a..31df1879bd 100644
--- a/macros/plain/graphics/psfrag.tex
+++ b/macros/plain/graphics/psfrag.tex
@@ -1,6 +1,9 @@
% Plain TeX interface to psfrag.
% David Carlisle
+% Note this needs etex not tex
+% as etex extensions are used to control expansion
+
\input miniltx
\makeatletter