Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8696#discussion_r42283806
  
    --- Diff: ec2/spark_ec2.py ---
    @@ -178,6 +178,9 @@ def parse_args():
             "-i", "--identity-file",
             help="SSH private key file to use for logging into instances")
         parser.add_option(
    +        "-p", "--profile", default="default",
    +        help=" If you have multiple profiles, you can configure 
additional, named profiles by using this option (default: %default)")
    --- End diff --
    
    Can you expand this to explain what type of profile this is talking about? 
Like, maybe clarify whether it's an IAM or boto profile or whatever? As it 
stands now, I worry that this description isn't clear to people unfamiliar with 
this feature.


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