Actually 0.5 doesn't like that either:
```
root@apt-1:~# /usr/bin/aptly repo create custom -component="custom"
Usage: /usr/bin/aptly repo create <name>

/usr/bin/aptly repo create - create local repository


Options:
  -architectures="": list of architectures to consider during (comma-separated), default to all available
  -comment="": any text that would be used to described local repository
  -component="main": default component when publishing
  -config="": location of configuration file (default locations are /etc/aptly.conf, ~/.aptly.conf)
  -dep-follow-all-variants=false: when processing dependencies, follow a & b if depdency is 'a|b'
  -dep-follow-recommends=false: when processing dependencies, follow Recommends
  -dep-follow-source=false: when processing dependencies, follow from binary to Source packages
  -dep-follow-suggests=false: when processing dependencies, follow Suggests
  -distribution="": default distribution when publishing
root@apt-1:~# echo $?
0
```