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-rw-r--r--doc/coreutils.texi11
1 files changed, 10 insertions, 1 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index b216a2d19..9e8f2b63f 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -4670,9 +4670,18 @@ delete characters, then squeeze repeated characters from the result.
The @var{set1} and (if given) @var{set2} arguments define ordered
sets of characters, referred to below as @var{set1} and @var{set2}. These
sets are the characters of the input that @command{tr} operates on.
-The @option{--complement} (@option{-c}) option replaces @var{set1} with its
+The @option{--complement} (@option{-c}, @option{-C}) option replaces
+@var{set1} with its
complement (all of the characters that are not in @var{set1}).
+Currently @command{tr} fully supports only single-byte characters.
+Eventually it will support multibyte characters; when it does, the
+@option{-C} option will cause it to complement the set of characters,
+whereas @option{-c} will cause it to complement the set of values.
+This distinction will matter only when some values are not characters,
+and this is possible only in locales using multibyte encodings when
+the input contains encoding errors.
+
@exitstatus
@menu