Production Strategy Card building in "your" system

By hithlo, in Twilight Imperium 3rd Edition

The wording of the primary ability of the Production Strategy Card states:

Immediately build units in one of your systems containing one or more friendly Space Docks, receiving 2 addtional resources with which to build, even if you have activated this system already. Building units here does not activate the system.

My question has to do with the wording of "one of your systems". Does that mean any system in which you have a space dock? Or does that mean a system you control?

The reason I ask is because the wording of regular production doesn't require you control the system. However, the text of the Production card could be interpreted to mean you must control the system.

Please help clarify.

Thank you.

-hithlo

Control is not required. The choice of the wording "your system" is a bit vague and possibly misleading, but since it doesn't explicitely say "control", control isn't necessary. All you need is a SD. Heck, it could even be a BLOCKADED Space Dock, if you only want to build PDS and GF units.