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diff --git a/.vimrc b/.vimrc
index b802c908f..284bf8849 100644
--- a/.vimrc
+++ b/.vimrc
@@ -1,5 +1,20 @@
 " 'set exrc' in ~/.vimrc will read .vimrc from the current directory
+" Warning: Enabling exrc is dangerous! You can do nearly everything from a
+" vimrc configuration file, including write operations and shell execution.
+" You should consider setting 'set secure' as well, which is highly
+" recommended!
+
+" Note that we set a line width of 119 for .c and XML files, but for everything
+" else (such as journal catalog files, unit files, README files) we stick to a
+" more conservative 79 characters.
+
+" NOTE: If you update this file make sure to update .dir-locals.el and
+" .editorconfig, too.
+
 set tabstop=8
 set shiftwidth=8
 set expandtab
 set makeprg=GCC_COLORS=\ make
+set tw=79
+au BufRead,BufNewFile *.xml set tw=119 shiftwidth=2 smarttab
+au FileType c set tw=119