diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index aba6b0e..c8090b5 100644
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -43,7 +43,7 @@
 
 .. function:: factorial(x)
 
-   Return *x* factorial.  Raises :exc:`ValueError` if *x* is not intergral or
+   Return *x* factorial.  Raises :exc:`ValueError` if *x* is not integral or
    is negative.
 
 .. function:: floor(x)