Update to refer to new default branch

diff --git a/README.adoc b/README.adoc
index b810918..efacd37 100644
--- a/README.adoc
+++ b/README.adoc

@@ -19,7 +19,7 @@
 repository and adding the appropriate extension specifications, making changes
 to the appropriate XML file, etc. Note that any changes you propose to
 reserved values in the registry are not official until your pull request is
-*accepted* into the master branch.
+*accepted* into the main branch.
 
 Feel free to post issues on the repository if it's unclear how to do
 something you need to with extensions, or if you find any problems.
@@ -51,7 +51,7 @@
 * Request one or more blocks of unused enumerants for GL, GLX, or WGL
   depending on the needs of your extension, by adding the reservation(s) to
   the end of gl.xml, glx.xml, and/or wgl.xml.
-* Once the pull request modifying the XML files is accepted into master, you
+* Once the pull request modifying the XML files is accepted into main, you
   have control of those enumerant blocks.
 * Create an extension specification, following the model of existing vendor
   specifications under extensions/*vendor*/ .

diff --git a/index.php b/index.php
index 7d99f7e..661674a 100644
--- a/index.php
+++ b/index.php

@@ -24,7 +24,7 @@
 
 <p> The web registry is backed by a <a
     href="https://github.com/KhronosGroup/OpenGL-Registry"> github
-    repository</a>. Changes committed to the <b>master</b> branch of the
+    repository</a>. Changes committed to the <b>main</b> branch of the
     repository are reflected on the website. The repository includes
     everything visible on the registry website - specifications, extensions,
     headers, XML, and the index pages such as this one - as well as