diff --git a/README.md b/README.md
index 2f1dcc6..a7251c3 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,14 @@
 
 A crate for mucking around with piles of bytes.
 
+## Extensions
+
+There is experimental support for the `Zeroable` trait being derived through a
+proc-macro. I'm not the author of that crate, please file bugs with that crate
+in the other repo.
+
+* https://github.com/rodrimati1992/zeroable_crates
+
 ## Stability
 
 The goal is to stay at 1.0 until at least the next edition of Rust.