diff --git a/README.md b/README.md
index 749e7ec..8292bc5 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,12 @@
 
 -----------------------
 
+**NOTE:** `jkool-client-api` version `0.5.0` migrated to Java 11.
+
+Latest Java 8 compliant `jkool-client-api` version is `0.4.x`.
+
+-----------------------
+
 **NOTE:** `jkool-client-api` version `0.3.3` migrated from `javax.ws.rs` (Java EE) to `jakarta.ws.rs` (Jakarta EE) API.
 
 Latest Java EE compliant `jkool-client-api` version is `0.3.2.x`.