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diff --git a/man/zsplit.3 b/man/zsplit.3
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@@ -30,6 +30,9 @@ with
.I "(high==a)"
and
.IR "(low==a)" .
+.SH RATIONALE
+Splitting big integers in the described way is useful
+for divide-and-conquer algorithms.
.SH SEE ALSO
.BR zand (3),
.BR zor (3),