The FAA has just published updated Private and Instrument ACS documents. Changes to the documents are minimal, but to ensure you are using the most current versions, please update your records.

They can be found at http://www.faa.gov/training_testing/testing/acs/

Or

Click Here for the Private Pilot ACS Change 1 Effective June 15, 2016

and

Click Here for the Instrument Pilot ACS Change 1 Effective June 15, 2016