diff --git a/README.md b/README.md
index 7b591e8..28606f7 100644
--- a/README.md
+++ b/README.md
@@ -21,3 +21,12 @@ nextstrain view .
 
 - [Running a pathogen workflow](https://docs.nextstrain.org/en/latest/tutorials/running-a-workflow.html)
 - [Contributor documentation](./CONTRIBUTING.md)
+
+## Repo history
+This repo is an exact copy of the Nextstrain tb workflow at this point:
+https://github.com/nextstrain/tb/tree/dd3ef8a08eca138a0e4e8c26b3b34dc9c4d83139
+
+The repo was created through the following process:
+* Creating a mirror of the tb repo https://github.com/nextstrain/tb.git
+* Renaming `north-america-archived` to `main` and setting it as the default branch
+* Deleting all other branches