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-rw-r--r--Doc/library/math.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index b98f164..d6e0205 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -42,6 +42,10 @@ Number-theoretic and representation functions:
Return the absolute value of *x*.
+.. function:: factorial(x)
+
+ Return *x* factorial. Raises :exc:`ValueError` if *x* is not intergral or
+ is negative.
.. function:: floor(x)