diff --git a/Doc/library/random.rst b/Doc/library/random.rst
index 78c3cc0..b6b0b6c 100644
--- a/Doc/library/random.rst
+++ b/Doc/library/random.rst
@@ -191,6 +191,8 @@
    Return a random floating point number *N* such that ``a <= N <= b`` for
    ``a <= b`` and ``b <= N <= a`` for ``b < a``.
 
+   The end-point value ``b`` may or may not be included in the range
+   depending on floating-point rounding in the equation ``a + (b-a) * random()``.
 
 .. function:: triangular(low, high, mode)