diff --git a/src/doc/rustc-dev-guide/src/stability.md b/src/doc/rustc-dev-guide/src/stability.md
index 230925252bac3..e8589b7f4310c 100644
--- a/src/doc/rustc-dev-guide/src/stability.md
+++ b/src/doc/rustc-dev-guide/src/stability.md
@@ -183,4 +183,7 @@ the `deprecated_in_future` lint is triggered which is default `allow`, but most
 of the standard library raises it to a warning with
 `#![warn(deprecated_in_future)]`.
 
+## unstable_feature_bound
+The `#[unstable_feature_bound(foo)]` attribute can be used together with `#[unstable]` attribute to mark an `impl` of stable type and stable trait as unstable. In std/core, an item annotated with `#[unstable_feature_bound(foo)]` can only be used by another item that is also annotated with `#[unstable_feature_bound(foo)]`. Outside of std/core, using an item with `#[unstable_feature_bound(foo)]` requires the feature to be enabled with `#![feature(foo)]` attribute on the crate. Currently, only `impl`s and free functions can be annotated with `#[unstable_feature_bound]`.
+
 [blog]: https://www.ralfj.de/blog/2018/07/19/const.html