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diff --git a/doc/ToUpper.3 b/doc/ToUpper.3
index 0647b85..629a8e5 100644
--- a/doc/ToUpper.3
+++ b/doc/ToUpper.3
@@ -81,7 +81,7 @@ and all following characters into their lower-case equivalents.
.SH BUGS
.PP
At this time, the case conversions are only defined for the Unicode
-plane 0 characters. The result for Unicode characters above 0xffff
+plane 0 characters. The result for Unicode characters above 0xFFFF
is undefined, but - actually - only the lower 16 bits of the
character value is handled.