diff --git a/README.md b/README.md
index e3bac5c6c..f8056c6a6 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,7 @@ Table of Contents
 
 - Multi-column foreign key support
 - Materialized view support
+  - Only postgresql is supported
 
 ### Supported Databases