diff --git a/README.md b/README.md
index a047489..cdc8d8d 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,9 @@ downloading, streaming, and mirroring. It was first published in 2022. The
 manifest files' data is serialized with Google's
 [protobuf serialization format](https://developers.google.com/protocol-buffers).
 The structure of these files can be found
-[in the format specification](https://git.eeqj.de/sneak/mfer/src/branch/main/mfer/mf.proto)
-which is included in the [project repository](https://git.eeqj.de/sneak/mfer).
+[in the format specification](docs/FORMAT.md), which refers to the protobuf
+schema `mfer/mf.proto` for exact field numbers and types. Both are included in
+the [project repository](https://git.eeqj.de/sneak/mfer).
 
 The current version is pre-1.0 and while the repo was published in 2022, there
 has not yet been any versioned release. [SemVer](https://semver.org) will be