diff --git a/README.md b/README.md
index 8886807e..fc095a59 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,9 @@
 
 This repository is the central place for Rust development of the [libp2p](https://libp2p.io) spec.
 
+**Warning**: While we are trying our best to be compatible with other lib2p implementations, we
+cannot guarantee that it is the case considering the lack of a precise libp2p specifications.
+
 **This readme will be more fleshed out the closer the project gets to completion.
 Right now everything including the crate organization is very much Work in Progress.**