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diff --git a/doc/ref/api-data.texi b/doc/ref/api-data.texi
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--- a/doc/ref/api-data.texi
+++ b/doc/ref/api-data.texi
@@ -1901,6 +1901,19 @@ Return the uppercase character version of @var{chr}.
Return the lowercase character version of @var{chr}.
@end deffn
+@rnindex char-titlecase
+@deffn {Scheme Procedure} char-titlecase chr
+@deffnx {C Function} scm_char_titlecase (chr)
+Return the titlecase character version of @var{chr} if one exists;
+otherwise return the uppercase version.
+
+For most characters these will be the same, but the Unicode Standard
+includes certain digraph compatibility characters, such as @code{U+01F3}
+``dz'', for which the uppercase and titlecase characters are different
+(@code{U+01F1} ``DZ'' and @code{U+01F2} ``Dz'' in this case,
+respectively).
+@end deffn
+
@node Character Sets
@subsection Character Sets