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diff --git a/Master/texmf-dist/tex/latex/pgf/frontendlayer/libraries/tikzlibraryexternal.code.tex b/Master/texmf-dist/tex/latex/pgf/frontendlayer/libraries/tikzlibraryexternal.code.tex
index c3000401b0b..2488dfa4e79 100644
--- a/Master/texmf-dist/tex/latex/pgf/frontendlayer/libraries/tikzlibraryexternal.code.tex
+++ b/Master/texmf-dist/tex/latex/pgf/frontendlayer/libraries/tikzlibraryexternal.code.tex
@@ -26,6 +26,8 @@
% \pdf@mdfivesum is available for pdftex and lualatex and computes the
% md5 sum. Note that pdftex has \pdfmdfivesum, but lualatex does not
% have it.
+%
+% ... also used for \pdf@shellescape.
\usepackage{pdftexcmds}
% source generic implementation: