Update README.md

Author: ianopolous

README.md

@@ -64,16 +64,16 @@ Then run commands like:
 ipfs.refs.local();
 ```
 
-To add a file use:
+To add a file use (the add method returns a list of merklenodes, in this case there is only one element):
 ```Java
 NamedStreamable.FileWrapper file = new NamedStreamable.FileWrapper(new File("hello.txt"));
-MerkleNode addResult = ipfs.add(file);
+MerkleNode addResult = ipfs.add(file).get(0);
 ```
 
 To add a byte[] use:
 ```Java
 NamedStreamable.ByteArrayWrapper file = new NamedStreamable.ByteArrayWrapper("hello.txt", "G'day world! IPFS rocks!".getBytes());
-MerkleNode addResult = ipfs.add(file);
+MerkleNode addResult = ipfs.add(file).get(0);
 ```
 
 To get a file use: