Update README

README.md

@@ -96,7 +96,7 @@ This is WIP, some further features to come.  Features available:
 - [X] Copy to S3
 - [X] Copy from S3
 - [X] Copy S3 to S3
-- [ ] Copy S3 to S3 in another account with seperate credentials
+- [X] Copy S3 to S3 in another account with seperate credentials
 
 Please raise an issue if theres a specific feature you. would like considered or prioritised.
 
@@ -109,6 +109,8 @@ Please raise an issue if theres a specific feature you. would like considered or
                                 The AWS KMS key ID that should be used to server-side encrypt the object in S3.
       --acl=private             Object ACL
       --storage-class=STANDARD  Storage Class
+      --dest-profile=DEST-PROFILE  
+                                Destination bucket AWS credentials/config file profile to use if different from --profile
 
 Args:
   <source>       file or s3 location
@@ -125,6 +127,8 @@ For optimal throughput consider using a S3 VPC Gateway endpoint if you are execu
 
 And remember the performance of the source storage device is important, you don't want to choke it reading lots of data at once.  Use an optimized iops device or SAN.
 
+For S3 to S3 with different AWS profiles, object must be downloaded from the source and the uploaded.  To cater for large objects and to limit memory usage this is done utilizing multi parts by relies on GO garbage collector to tidy things up promptly which doesn't always happen  Some further optimizations are WIP but expect this operation to consume a bit of memory.
+
 ### Multiparts
 Multipart chunks size for Upload or Download is set to 5MB.  Any objects greater than 5MB in size shal be sent in multiparts. `s3kor` will send up to 5 parts concurrently per object.