diff --git a/guide/english/python/abs-function/index.md b/guide/english/python/abs-function/index.md
index 8fbbbc39ff..90275845ac 100644
--- a/guide/english/python/abs-function/index.md
+++ b/guide/english/python/abs-function/index.md
@@ -1,7 +1,8 @@
 ---
 title: Python Abs Function
 ---
-`abs()` is a built-in function in Python 3, to compute the absolute value of any number. The absolute value of a number "means only how far a number is from 0" <sup>1</sup> It takes one argument `x`. The argument can even be a <a href='https://docs.python.org/3.0/library/cmath.html' target='_blank' rel='nofollow'>complex number</a>, or a <a href='https://en.wikipedia.org/wiki/Expression_(mathematics)' target='_blank' rel='nofollow'>mathematical expression</a>. 
+
+In Python 3,`abs()` is a built-in function that computes the absolute value of any number. The absolute value of a number "means only how far a number is from 0" <sup>1</sup> It takes one argument `x`, and the argument can even be a <a href='https://docs.python.org/3.0/library/cmath.html' target='_blank' rel='nofollow'>complex number</a>, in which case its <a href='http://www.mathcentre.ac.uk/resources/sigma%20complex%20number%20leaflets/sigma-complex9-2009-1.pdf' target='_blank' rel='nofollow'>modulus</a> is returned.
 
 ## Argument
 
@@ -28,4 +29,4 @@ print(abs(3 - 4j - 3 - 4j)) # prints 8.0, because |(3 - 3) + (- 4j - 4j)| = 8.0
 <a href='https://docs.python.org/3/library/functions.html#abs' target='_blank' rel='nofollow'>Official Docs</a>
 
 ### Sources
-1. <a href='https://www.mathsisfun.com/numbers/absolute-value.html' target='_blank'>Math Is Fun. Accessed: October 25, 2017</a>
+1. <a href='https://www.mathsisfun.com/numbers/absolute-value.html' target='_blank'>Math Is Fun. Accessed: October 25, 2017</a>
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