Google CEO Larry Page provided the first public details of the voice ailment that sidelined him from speaking engagements last summer, saying that he has limited movement in his left and right vocal cords.

The 40-year-old said that doctors have been unable to identify a cause for the “very rare” nerve problems affecting his vocal cords, but that he has been making progress in his recovery and is “fully able to do all I need to at home and at work.”