I searched both the API and Guide and could not find an ng-required directive explicitly mentioned anywhere. On the 'input' page (the only place required comes up) the list of attributes for the input shown are just [required]. I actually ended up building a ui-required for AngularUI before someone told me that ng-required actually exists.

Can you guys add it to the docs? Or at least on the directive page.

I realize 'required' is mentioned several times in the docs, however I assumed it was the native html5 required which CAN have ="something" but this isn't an angular expression. There is not a single mention of ngRequired however.