Add notes for cutting release branches

README.RELEASE_PROCESS

@@ -327,6 +327,28 @@ Please make sure that the mail to php-announce@ is its own completely separate e
 This is to make sure that replies to the announcement on php-general@ or internals@
 will not accidentally hit the php-announce@ mailinglist.
 
+Forking a new release branch
+----------------------------
+
+1. One week prior to cutting X.Y.0beta1, warn internals@ that your version's branch
+   is about to be cut, and that PHP-X.Y will be moving into feature freeze.
+   Try to be specific about when the branch will be cut.
+      Example: http://news.php.net/php.internals/99864
+
+2. Just prior to cutting X.Y.0beta1, create the new branch locally.
+   Add a commit on master after the branch point clearing the NEWS file, and updating
+     main/php_versions.h and Zend/zend.h to update versions.
+     Example: https://github.com/php/php-src/commit/5230541ef59e0637d5522293a7d099bf18ce6af3
+   Push the new branch and the commit just added to master.
+
+3. Immediately notify internals@ of the branch cut and advise the new merging order:
+     Example: http://news.php.net/php.internals/99903
+
+4. Update php-web:git.php and wiki.php.net/vcs/gitworkflow to reflect the new branch:
+     Example: https://github.com/php/web-php/commit/74bcad4c770d95f21b7fbeeedbd76d943bb83f23
+
+5. Notify nlopess@ to add PHP_X_Y tag to gcov.php.net
+
 New Release Manager Checklist
 -----------------------------