diff --git a/Cargo.toml b/Cargo.toml
index b9f59930aa..da6c4d55eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,4 +49,5 @@ uuid = { version = "1.4", features = ["v4"] }
 
 [patch.crates-io]
 cc-11 = { git = "https://github.com/tea/cc-rs", branch="riscv-abi-arch-fix", package = "cc" }
+# https://github.com/briansmith/ring/issues/1999
 ring = { git = "https://gitlab.redox-os.org/redox-os/ring.git", branch = "redox-0.17.8" }