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diff --git a/Master/texmf-dist/tex/latex/checkend/checkend.sty b/Master/texmf-dist/tex/latex/checkend/checkend.sty
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+%
+% Copyright (C) 2002-2019 Javier Bezos http://www.texnia.com
+%
+% This file may be distributed and/or modified under the conditions of
+% the MIT License. A version can be found at the end of this file.
+% 
+% Usage
+% ~~~~~
+% When an environment is left open, LaTeX gives an error at the
+% end of the document. However it only informs about the first
+% of them, while the rest are shown with meaningless errors:
+% 
+% (\end occurred inside a group at level N)
+% 
+% This package replaces them with more useful messages
+% which show which environments (in reverse order) were
+% not closed.
+% 
+% That's all. There are no user macros. Just use the package.
+%
+% Code
+% ~~~~
+
+\def\fileversion{1.1}
+\def\filedate{2002/04/20}
+
+\ProvidesPackage{checkend}[2002/04/20 v1.0 Environment checking]
+
+\def\chkend@checkend{%
+  \def\@tempa{document}%
+  \ifx\@currenvir\@tempa
+  \else
+    \count@\errorcontextlines
+    \errorcontextlines\z@
+    \PackageError{checkend}{%
+      \@currenvir \@currenvline \space open at 
+         \string\end{document}}%
+      {The package has detected an open environment at the 
+         end\MessageBreak
+       of the document}%
+    \errorcontextlines\count@
+    \csname end\@currenvir\endcsname
+    \endgroup
+    \chkend@checkend
+  \fi}
+
+\AtEndDocument{\chkend@checkend}
+
+\endinput
+
+MIT License
+-----------
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+\ No newline at end of file