diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+> **Warning**
+> Deprecation notice: This SDK is for Nabto 4/Micro (uNabto). For new projects, the next generation Nabto 5/Edge should be used instead. Read about the differences [here](https://docs.nabto.com/developer/guides/concepts/overview/edge-vs-micro.html).
+
 # uNabto SDK
 
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