Colin Kaepernick is writing a memoir that will be released through his own publishing company.

Kaepernick has been out of a job in the NFL the last three years. He filed a grievance against the NFL, contending teams colluded to keep him out. The sides reached an undisclosed settlement.

Kaepernick will write about that experience and what prompted his activism.

“My protest was the culmination of years of thought and experiences, of learning and unlearning,” Kaepernick said in a statement. “I want to tell the story of my evolution, and the events that led me to protest systemic oppression, in hopes that it will inspire others to rise in action.”