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-rw-r--r--doc/misc/ediff.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/misc/ediff.texi b/doc/misc/ediff.texi
index 8a7de88d655..cbc7556aa82 100644
--- a/doc/misc/ediff.texi
+++ b/doc/misc/ediff.texi
@@ -1869,7 +1869,8 @@ These variables specify the options to pass to the above utilities.
In @code{ediff-diff-options}, it may be useful to specify options
such as @samp{-w} that ignore certain kinds of changes. However,
Ediff does not let you use the option @samp{-c}, as it doesn't recognize this
-format yet.
+format yet. (If you alter this variable, it should be done via the
+Customize interface instead of using @code{setq} directly.)
@item ediff-coding-system-for-read
@vindex ediff-coding-system-for-read