diff --git a/rbackup/script.py b/rbackup/script.py
index 927e7f1..173fdfa 100644
--- a/rbackup/script.py
+++ b/rbackup/script.py
@@ -25,15 +25,19 @@ syslog = logging.getLogger(__name__)
 def do_backup(repository, parsed_config, args, extra_rsync_opts=None):
     """Run a backup operation.
 
-    It is up to the caller to decide on how to instantiate the Repository object.
+    A backup operation requires a repository, config options to read from, and the
+    arguments that were passed when the script was started.
+
+    It is up to the caller to decide on how to instantiate the ``Repository`` object.
 
     :param repository: repository to operate on
     :type repository: ``rbackup.struct.repository.Repository`` object
-    :param parsed_config:
+    :param parsed_config: config file parser
     :type parsed_config: ``configparser.ConfigParser`` object
-    :param args: arguments relevant to the backup operation
+    :param args: arguments passed when the script was called
     :type args: ``argparse.Namespace`` object
-    :param extra_rsync_opts: more options to pass to rsync
+    :param extra_rsync_opts: options to pass to rsync that weren't included
+        in args (default: ``None``)
     :type extra_rsync_opts: iterable
     """
     rsync_opts = config.load_list_from_option(
@@ -74,4 +78,3 @@ def do_backup(repository, parsed_config, args, extra_rsync_opts=None):
             syslog.critical(f"Failing command: {e.cmd}")
             syslog.critical(e.stderr)
             exit(e.returncode)
-