diff --git a/README.md b/README.md
index 990ba9b..2983c3f 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@
 
 This repository adds custom Spark JDBC dialects, enhansing or fixing Apache Spark issues with handling some JDBC types.
 
+**Note**: for now only Spark 3.5.x is supported.
+
 ## Documentation Index
 
 - [**Using the Dialect**](docs/using_the_dialect.md)