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diff --git a/man/zmodpow.3 b/man/zmodpow.3
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@@ -29,6 +29,10 @@ Mod
It is safe to call
.B zmodpow
with non-unique parameters.
+.SH RATIONALE
+It is possible to calculate the modular power
+with a faster algorithm than calculating the
+power and than the modulus of that power.
.SH SEE ALSO
.BR zmodmul (3),
.BR zsqr (3),