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-rw-r--r--lib/libc/locale/isupper.36
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/libc/locale/isupper.3 b/lib/libc/locale/isupper.3
index 90dd465..dd96238 100644
--- a/lib/libc/locale/isupper.3
+++ b/lib/libc/locale/isupper.3
@@ -52,9 +52,11 @@ The
function tests for any upper-case letter.
For single C
.Va char Ns s
-locales the value of the argument is
+locales (see
+.Xr multibyte 3 )
+the value of the argument is
representable as an
-.Va unsigned char
+.Li unsigned char
or the value of
.Dv EOF .
In the ASCII character set, this includes the following characters
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