<para>
The <literal>random</literal> function generates values using a uniform
distribution, that is all the values are drawn within the specified
- range with equal probability. The <literal>random_exponential</literal> and
- <literal>random_gaussian</literal> functions require an additional double
- parameter which determines the precise shape of the distribution.
+ range with equal probability. The <literal>random_exponential</literal>,
+ <literal>random_gaussian</literal> and <literal>random_zipfian</literal>
+ functions require an additional double parameter which determines the precise
+ shape of the distribution.
</para>
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