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-rw-r--r--doc/posix-functions/isblank.texi8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/posix-functions/isblank.texi b/doc/posix-functions/isblank.texi
index ab23391ac6..18b09fd903 100644
--- a/doc/posix-functions/isblank.texi
+++ b/doc/posix-functions/isblank.texi
@@ -24,7 +24,7 @@ Portability problems not fixed by Gnulib:
Note: This function's behaviour depends on the locale, but does not support
the multibyte characters that occur in strings in locales with
@code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales).
-There are four alternative APIs:
+There are five alternative APIs:
@table @code
@item c_isblank
@@ -37,6 +37,12 @@ order to use it, you first have to convert from multibyte to wide characters,
using the @code{mbrtowc} function. It is provided by the Gnulib module
@samp{wctype}.
+@item c32isblank
+This function operates in a locale dependent way, on 32-bit wide characters.
+In order to use it, you first have to convert from multibyte to 32-bit wide
+characters, using the @code{mbrtoc32} function. It is provided by the
+Gnulib module @samp{c32isblank}.
+
@item mb_isblank
This function operates in a locale dependent way, on multibyte characters.
It is provided by the Gnulib module @samp{mbchar}.