diff --git a/README.md b/README.md
index 364d591..5d9e5c9 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,8 @@ Pull requests to fix issues with the bot are more than welcome.
 
 ## What does it do?
 
-After doing the self-update, the bot will visit each of the listed `PULL_REPOS`.
+After doing the self-update, the bot will clone the latest `MAIN_REPO` and resync `PUSH_REPO`/master.
+After that, each of the `PULL_REPOS` is visited.
 It will look for PRs on GitHub labelled with `LABEL_TO_FETCH` and merge those onto the `MAIN_REPO`/master branch.
 If a PR fails to merge it will be ignored.
 Once everything has been merged the bot will push the resulting files to the `PUSH_REPO`/`self.branch_name` branch.
diff --git a/tag_build.py b/tag_build.py
index c8df42b..0554bc4 100644
--- a/tag_build.py
+++ b/tag_build.py
@@ -154,6 +154,9 @@ class TagMergeBot:
 
         return total_failed
 
+    def sync(self):
+        _git("push", "-f", self.push_repo["name"], "master", cwd=self.tracking_path)
+
     def push(self):
         _git("push", "-f", self.push_repo["name"], self.branch_name, cwd=self.tracking_path)
 
@@ -212,6 +215,7 @@ if __name__ == "__main__":
     # TODO: Rework this whole workflow to be sane.
     # m = MergeBot(PULL_REPOS, PUSH_REPO)
     t.reclone()
+    t.sync()
     t.pull_branches()
     failed = t.merge()
     logger.info("Number of failed merges: {failed}".format(failed=failed))