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-rw-r--r--lib/libc/locale/tolower.32
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/libc/locale/tolower.3 b/lib/libc/locale/tolower.3
index 1bd82c2..dfb7c25 100644
--- a/lib/libc/locale/tolower.3
+++ b/lib/libc/locale/tolower.3
@@ -51,6 +51,8 @@ The
.Fn tolower
function converts an upper-case letter to the corresponding lower-case
letter.
+For 8-bit wide locales the value of the argument is
+representable as an unsigned char or the value of EOF.
.Sh RETURN VALUES
If the argument is an upper-case letter, the
.Fn tolower
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