Add a commented-out recipe on making trailing whitespace explicit.
If people think this is not too intrusive it could be uncommented.
diff --git a/Misc/vimrc b/Misc/vimrc
index 93abef6..85ce348 100644
--- a/Misc/vimrc
+++ b/Misc/vimrc
@@ -76,3 +76,10 @@
" Automatically indent: ``filetype indent on``
" Fold based on indentation: ``set foldmethod=indent``
+
+" Make trailing whitespace explicit:
+"highlight WhitespaceEOL ctermbg=red guibg=red
+"match WhitespaceEOL /\s\+$/
+" or
+"set list listchars=trail:-
+