diff --git a/README.md b/README.md
index 4142d82..91415b2 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,11 @@ There is currently no support for encoding the protobuf wire format.
 Groups (`SGROUP` and `EGROUP`) are not supported. By default, parsing fails if
 one is encountered. See `Config.ignore_groups` for more information.
 
+This project is being mirrored between
+[GitHub](https://github.com/gavinmorrow/protobin) and
+[Tangled](https://tangled.org/did:plc:3qqi3txdc76aawdcimemtwhb). Issues and PRs
+can be created on either.
+
 ```sh
 gleam add protobin@2
 ```