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diff --git a/doc/unigbrk.texi b/doc/unigbrk.texi
index af4d996..e7e94d6 100644
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+++ b/doc/unigbrk.texi
@@ -62,6 +62,8 @@ Note that these functions do not handle the case when a character
outside of the range between @var{start} and @var{s} is needed to
determine the boundary. Use @func{_grapheme_breaks} functions for such
cases.
+
+Note also that these functions work only on well-formed Unicode strings.
@end deftypefun
The following functions determine all of the grapheme cluster