diff --git a/README.md b/README.md
index 964d027..12cd6f0 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@ FFI
 
 An easy way to call external functions (e.g. C functions) from Elixir.
 
+** This is alpha software **
+
 ## Example Program
 
 ```elixir