--- doc/ref/api-data.texi.0	2009-12-21 22:40:16.226406152 -0800
+++ doc/ref/api-data.texi	2009-12-21 23:07:43.902405881 -0800
@@ -1901,6 +1901,17 @@
 Return the lowercase character version of @var{chr}.
 @end deffn
 
+@tindex scm_t_wchar
+@deftypefn {C Function} scm_t_wchar scm_c_upcase (scm_t_wchar @var{c})
+@deftypefnx {C Function} scm_t_wchar scm_c_downcase (scm_t_wchar @var{c})
+@deftypefnx {C Function} scm_t_wchar scm_c_titlecase (scm_t_wchar @var{c})
+
+These C functions take an integer representation of a Unicode
+codepoint and return the codepoint corresponding to its uppercase,
+lowercase, and titlecase forms respectively.  The type
+@code{scm_t_wchar} is a signed, 32-bit integer.
+@end deftypefn
+
 @node Character Sets
 @subsection Character Sets