Update README.md

Author: interference-project

README.md

@@ -12,8 +12,10 @@
 ## Concepts & features
 
 - supports Base JPA annotations
-- supports distributed SQL queries
+- supports local & distributed SQL queries
 - supports transactions
+- supports unique constraints
+- supports persistent indexes
 - runs in the same JVM with local application
 - can be used as a local or distributed SQL database
 - can be used as persistent layer for a distributed application
@@ -25,6 +27,12 @@
   the launch of any additional coordinators. All cluster nodes are equivalent.
 - supports complex event processing and streaming SQL (in next release)
 
+## NOTE:
+nterference is not a RDBMS in the classical sense, and it does 
+not contain ddl operations (the table structure is created on the basis 
+of @Entity class JPA-compatible annotations), foreign keys. Standard 
+dml operations, like UPDATE, DELETE for bulk changes and check constraints 
+are planned to be implemented in future versions.
 
 ## Quick Start Application