Update README.md

paf31 · web-flow · commit 075a2876c0a9 · 2016-12-22T19:52:06.000-08:00
diff --git a/README.md b/README.md
@@ -4,6 +4,8 @@
 
 Types and kinds for basic type-level programming
 
+_Note_: this library is a work in progress, and depends on compiler features which have not been officially released yet.
+
 ## Installation
 
 ```
