diff --git a/guide/english/mathematics/absolute-value/index.md b/guide/english/mathematics/absolute-value/index.md
index 3c994cac74..d87fb9f41d 100644
--- a/guide/english/mathematics/absolute-value/index.md
+++ b/guide/english/mathematics/absolute-value/index.md
@@ -40,6 +40,6 @@ Here you can see that in the graph of y = |x|, if -2 is input in to the function
 |-125| = 125
 
 #### More Information:
-<a href='http://www.purplemath.com/modules/absolute.htm "Absolute Value"' target='_blank' rel='nofollow'>Absolute Value</a>
+[Purplemath](https://www.purplemath.com/modules/absolute.htm)