diff --git a/README.md b/README.md
index b02135c295d186b9aa988157e4ab9cb33409b936..3fadc0c69386b1db306dec85cfc4c3a5550c00f2 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,9 @@ client library for CaosDB and a part of the CaosDB project.
 ## Setup
 
 Please read the [README\_SETUP.md](README_SETUP.md) for instructions
-on how to develop, build, and use this code.
+on how to develop, build, and use this code. caosdb-julialib is
+developped and tested using Julia 1.6, we cannot guarantee its
+compatibility with versions <= 1.5.
 
 ## Further reading