message: Update unstable reference
diff: @@ -264,3 +264,20 @@ conflicting binaries from another package.
  Additionally, a new flag `--no-track` is available to prevent `cargo install`
  from writing tracking information in `$CARGO_HOME` about which packages are
  installed.
  +
  +### public-dependency
  +* Tracking Issue: [#44663](https://github.com/rust-lang/rust/issues/44663)
  +
  +The 'public-dependency' features allows marking dependencies as 'public'
  +or 'private'. When this feature is enabled, additional information is passed to rustc to allow
  +the 'exported_private_dependencies' lint to function properly.
  +
  +This requires the appropriate key to be set in `cargo-features`:
  +
  +```toml
  +cargo-features = ["public-dependency"]
  +
  +[dependencies]
  +my_dep = { version = "1.2.3", public = true }
  +private_dep = "2.0.0" # Will be 'private' by default
  +```
  