Update README.md

clarification about default DB

README.md

@@ -106,6 +106,8 @@ nocodb/nocodb:latest
 
 > If you plan to input some special characters, you may need to change the character set and collation yourself when creating the database. Please check out the examples for [MySQL Docker](https://github.com/nocodb/nocodb/issues/1340#issuecomment-1049481043).
 
+> Different commands just indicate the database that NocoDB will use internally for metadata storage, but that doesn't influence the ability to connect to a different database type. 
+
 ## Binaries
 
 ##### MacOS (x64)
@@ -305,4 +307,4 @@ Thank you for your contributions! We appreciate all the contributions from the c
 
 <a href="https://github.com/nocodb/nocodb/graphs/contributors">
   <img src="https://contrib.rocks/image?repo=nocodb/nocodb" />
-</a>
+</a>