Visual Studio 2008 - Where is the setting to switch on /off XML auto-comments?

As the title says, my XML auto-comment feature (/// or ''') has stopped working!

Spent half an hour trying t开发者_开发百科o find it in Tools/Options/Environment, Googled it, rebooted, etc still no luck :-(

Anyone knows where it is please?

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Print up the project properties and check the build tab. On there you should see something about "XML documentation file".