diff --git a/Readme.md b/Readme.md
index eea4872..38fbc3a 100644
--- a/Readme.md
+++ b/Readme.md
@@ -23,3 +23,13 @@ __GIT utilities__ -- repo summary, repl, changelog population, author commit per
 Interested in contributing? Awesome!
 
 Please read [Contributing](CONTRIBUTING.md) before you make a PR, thanks!
+
+## Main branch
+As of Git Extras 6.4 the assumed default branch name changed from `master` to `main`.
+This affects the Git Extras commands `git archive-file`, `git delete-merged-branches`, `git delta`, `git pull-request`, `git show-merged-branches`, `git show-unmerged-branches` and `git squash`.
+
+
+To change the default branch name to `master`: change either the configuration `git-extras.default-branch` or `init.defaultBranch` to `master`, the former takes precedence.
+
+
+`git config git-extras.default-branch master`