diff --git a/README.md b/README.md
index 70a01db..acce9a9 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # GeometriCS
-Geometry library for C#
+Geometry library for C#  
+
+WARNING: This library is not mature yet and is subject to significant change.