Mayor Bill de Blasio announced Thursday that NYPD officers will undergo a retraining. The announcement comes a day after a grand jury declined to indict a police officer in the chokehold death of a black man.

De Blasio and Police Commissioner Bill Bratton said that 22,000 officers citywide will participate in the three-day retraining aimed at improving the dynamic between police and the community.

Much of the retraining will focus on every aspect of the officer-civilian relationship, from an initial emergency phone call to the way officers speak with civilians. Some bullet points include how to communicate with an uncooperative or nonthreatening suspect and understanding ego and abuse of authority.

"If we're serious about change, we understand it can only be achieved with the people we serve," said de Blasio. "There's tremendous resolve here at the NYPD to find a way to draw closer to the community."

De Blasio said it is common for military members and other professionals to periodically undergo similar retraining.

The retraining comes after a grand jury declined to indict Officer Daniel Pantaleo in the death of Eric Garner, who died after being put in an apparent chokehold during an arrest.