diff --git a/docs/development/submitting-patches.rst b/docs/development/submitting-patches.rst
index 810b874..6610584 100644
--- a/docs/development/submitting-patches.rst
+++ b/docs/development/submitting-patches.rst
@@ -151,6 +151,6 @@
 
 .. _`Write comments as complete sentences.`: http://nedbatchelder.com/blog/201401/comments_should_be_sentences.html
 .. _`syntax`: http://sphinx-doc.org/domains.html#info-field-lists
-.. _`Studies have shown`: http://www.ibm.com/developerworks/rational/library/11-proven-practices-for-peer-review/
+.. _`Studies have shown`: https://smartbear.com/smartbear/media/pdfs/wp-cc-11-best-practices-of-peer-code-review.pdf
 .. _`our mailing list`: https://mail.python.org/mailman/listinfo/cryptography-dev
 .. _`doc8`: https://github.com/stackforge/doc8