diff --git a/core-concepts/did-ddo.md b/core-concepts/did-ddo.md
index 33a7a2b2..0cc87d54 100644
--- a/core-concepts/did-ddo.md
+++ b/core-concepts/did-ddo.md
@@ -219,39 +219,111 @@ During the publish process, file URLs must be encrypted with a respective _Provi
 
 where "files" contains one or more storage objects.
 
-Type of objects supported :
+**Type of objects supported:**
 
-| Type  | Description                              | Example                                                           |
-| ----- | ---------------------------------------- | ----------------------------------------------------------------- |
-| `url` | Static URL. Contains url and HTTP method | <pre class="language-json"><code class="lang-json">[</code></pre> |
-| {     |                                          |                                                                   |
+**`URL`**
+
+Static URLs. 
+
+Parameters: 
+* `url` - File url
+* `method` - The HTTP method 
+* `headers` - Additional HTTP headers
 
 ```
-"type": "url",
-"url": "https://url.com/file1.csv",
-"method": "GET",
-"headers":
-  [
-   {"Authorization": "Bearer 123"}, 
-   {"APIKEY": "124"},
-  ]
+{
+    "type": "url",
+    "url": "https://url.com/file1.csv",
+    "method": "GET",
+    "headers":
+    [
+        {"Authorization": "Bearer 123"}, 
+        {"APIKEY": "124"},
+    ]
+}
+```
+
+**`IPFS`**
+
+The [Interplanetary File System](https://ipfs.tech/) (IPFS) is a distributed file storage protocol that allows computers all over the globe to store and serve files as part of a giant peer-to-peer network. Any computer, anywhere in the world, can download the IPFS software and start hosting and serving files.
+
+Parameters:
+* `hash` - The file hash
+
+```
+{
+	"type": "ipfs",
+	"hash": "XXX"
+}
+```
+
+**`GraphQL`**
+
+[GraphQL](https://graphql.org/) is a query language for APIs and a runtime for fulfilling those queries with your existing data. 
+
+Parameters:
+* `url` - Server endpoint url
+* `query` - The query to be executed
+
+```
+{
+	"type": "graphql",
+	"url": "http://172.15.0.15:8000/subgraphs/name/oceanprotocol/ocean-subgraph",
+	"query": """query{
+            nfts(orderBy: createdTimestamp,orderDirection:desc){
+                 id
+                 symbol
+                 createdTimestamp
+            }
+          }"""
+}
+```
+
+**`On-Chain`**
+
+Use a smart contract as data source.
+
+Parameters: 
+
+* `chainId` - The chainId used to query the contract
+* `address` - The smartcontract address
+* `abi` - The function abi (NOT the entire contract abi)
+
+```
+{
+	"type": "smartcontract",
+	"address": "0x8149276f275EEFAc110D74AFE8AFECEaeC7d1593",
+	"abi": {
+			"inputs": [],
+			"name": "swapOceanFee",
+			"outputs": [{"internalType": "uint256", "name": "", "type": "uint256"}],
+			"stateMutability": "view",
+			"type": "function",
+		}
+}
+```
+
+**`Arweave`** 
+
+[Arweave](https://www.arweave.org/) is a decentralized data storage that allows to permanently store files over a distributed network of computers.
+
+Parameters:
+* `transactionId` - The transaction identifier
+
+```
+{
+    {
+    "type": "arweave",
+    "transactionId": "a4qJoQZa1poIv5guEzkfgZYSAD0uYm7Vw4zm_tCswVQ",
+  }
+}
 ```
 
-} ] |
 
 First class integrations supported in the future :
-
-| Type   | Description | Example                                                           |
-| ------ | ----------- | ----------------------------------------------------------------- |
-| `ipfs` | IPFS files  | <pre class="language-json"><code class="lang-json">[</code></pre> |
-| {      |             |                                                                   |
-
-```
-"type": "ipfs",
-"hash": "XXX"
-```
-
-} ] | | `filecoin` | Filecoin storage | | | `arwave` | Arwave | | | `storj` | Storj | | | `sql` | Sql connection, dataset is generated by a query | |
+**`Filecoin`**
+**`Storj`**
+**`SQL`**
 
 A service can contain multiple files, using multiple storage types.