diff --git a/crates/bunch/RUSTSEC-0000-0000.md b/crates/bunch/RUSTSEC-0000-0000.md
new file mode 100644
index 0000000..87bf5b2
--- /dev/null
+++ b/crates/bunch/RUSTSEC-0000-0000.md
@@ -0,0 +1,18 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "bunch"
+date = "2020-11-12"
+url = "https://github.com/krl/bunch/issues/1"
+categories = ["memory-corruption"]
+
+[versions]
+patched = []
+```
+
+# `impl Sync for Bunch<T>` needs a Sync bound on T
+
+Affected versions of this crate unconditionally implements `Sync` for `Bunch<T>`.
+This allows users to insert `T: !Sync` to `Bunch<T>`. It is possible to create a data race to a `T: !Sync` by invoking the `Bunch::get()` API (which returns `&T`) from multiple threads.
+
+Such data races can lead to memory corruption.