mcel: document that errno is unspecified

diff --git a/lib/mcel.h b/lib/mcel.h
index 66a75bc53fd0398dda8bb2da5b6053d6dd17eb48..ebdd135f63af58291597c2921d57fc88c774b00d 100644 (file)
--- a/lib/mcel.h
+++ b/lib/mcel.h
@@ -22,6 +22,7 @@
    However, they do not support obsolescent encodings like CP864,
    EBCDIC, Johab, and Shift JIS that glibc also does not support,
    and it is up to the caller to coalesce encoding-error bytes if desired.
+   The value of errno is unspecified after calls to these macros.
 
    The mcel_scan function lets code iterate through an array of bytes,
    supporting character encodings in practical use