Update arrays.md

astonzhang · astonzhang · commit eda34478f02c · 2020-02-12T02:53:32.000Z
diff --git a/units/arrays.md b/units/arrays.md
@@ -22,7 +22,7 @@ submission you will need to use Jupyter.
 
 ## Content
 
-* [Autograd](https://en.d2l.ai/chapter_crashcourse/autograd.html)
+* [Autograd](https://d2l.ai/chapter_preliminaries/autograd.html)
 
 ## Videos
 
