This should just work out of the box. It does not for some people, I don't know what is different for them. Here is how to turn it on if it is not working for you, or how to change the key bindings. Go to Window - Preferences and navigate to General > Keys. Ignore the scheme as show in the image below, you can use whatever scheme you want. Select Edit for the Category and Content Assist for the Name. Look under Assignments for Editing Wod Files.
If you see it, you can select it and edit the binding in the Key Sequence panel. If you don't see Editing Wod Files, select it under When and click Add.