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diff --git a/Doc/library/random.rst b/Doc/library/random.rst
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@@ -153,6 +153,15 @@ be found in any statistics text.
Return a random floating point number *N* such that ``a <= N < b``.
+.. function:: triangular(low, high, mode)
+
+ Return a random floating point number *N* such that ``low <= N < high``
+ and with the specified *mode* between those bounds.
+
+ If *mode* is not specified or is ``None``, it defaults to the midpoint
+ between the upper and lower bounds, producing a symmetric distribution.
+
+ The default values for *low* and *high* are zero and one.
.. function:: betavariate(alpha, beta)