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diff --git a/lisp/dired.el b/lisp/dired.el
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@@ -59,6 +59,10 @@
May contain all other options that don't contradict `-l';
may contain even `F', `b', `i' and `s'. See also the variable
`dired-ls-F-marks-symlinks' concerning the `F' switch.
+Options that include embedded whitespace must be quoted
+like this: \\\"--option=value with spaces\\\"; you can use
+`combine-and-quote-strings' to produce the correct quoting of
+each option.
On systems such as MS-DOS and MS-Windows, which use `ls' emulation in Lisp,
some of the `ls' switches are not supported; see the doc string of
`insert-directory' in `ls-lisp.el' for more details."