diff --git a/Cargo.lock b/Cargo.lock
index 2fa56aaa77..2d615ee654 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -720,7 +720,7 @@ dependencies = [
 
 [[package]]
 name = "rustpython"
-version = "0.0.1"
+version = "0.0.1-pre-alpha.1"
 dependencies = [
  "clap 2.31.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index a1f366cd43..33c278da33 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rustpython"
-version = "0.0.1"
+version = "0.0.1-pre-alpha.1"
 authors = ["Windel Bouwman", "Shing Lyu <shing.lyu@gmail.com>"]
 edition = "2018"
 
diff --git a/wasm/lib/README.md b/wasm/lib/README.md
index 6d2f89d932..989e5952e3 100644
--- a/wasm/lib/README.md
+++ b/wasm/lib/README.md
@@ -7,6 +7,10 @@ A Python-3 (CPython >= 3.5.0) Interpreter written in Rust.
 [![Contributors](https://img.shields.io/github/contributors/RustPython/RustPython.svg)](https://github.com/RustPython/RustPython/graphs/contributors)
 [![Gitter](https://badges.gitter.im/RustPython/Lobby.svg)](https://gitter.im/rustpython/Lobby)
 
+# WARNING: this project is still in a pre-alpha state!
+
+**Using this in a production project is inadvisable. Please only do so if you understand the risks.**
+
 ## Usage
 
 ### Check out our [online demo](https://rustpython.github.io/demo/) running on WebAssembly.