diff --git a/core-concepts/did-ddo.md b/core-concepts/did-ddo.md
index bb144da5..535daeb7 100644
--- a/core-concepts/did-ddo.md
+++ b/core-concepts/did-ddo.md
@@ -256,7 +256,7 @@ Use GraphQL querys as datasource.
 
 ```
 {
-  "type": "graphql",
+	"type": "graphql",
 	"url": "http://172.15.0.15:8000/subgraphs/name/oceanprotocol/ocean-subgraph",
 	"query": """
     	query{
@@ -288,6 +288,12 @@ Use a smart contract as datasource.
 }
 ```
 
+First class integrations supported in the future :
+***`Filecoin`***
+***`Arwave`***
+***`Storj`***
+***`SQL`***
+
 A service can contain multiple files, using multiple storage types.
 
 Example: