diff --git a/docs/index.rst b/docs/index.rst
index 3af74fe..70f99fe 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -51,7 +51,7 @@
 For developers
 ^^^^^^^^^^^^^^
 
-- `NDN Software Contributor's Guide <https://github.com/named-data/.github/blob/master/CONTRIBUTING.md>`__
+- `NDN Software Contributor's Guide <https://github.com/named-data/.github/blob/main/CONTRIBUTING.md>`__
   (guide for newcomers to the NDN community of software)
 
 - :doc:`specs`