B737-800
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 300; Flight Crew Type 20000
Communication Breakdown
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Human Factors
Issued a HAZMAT NOTAC with regard to one package containing a Fire Extinguisher Class 2.2 HAZMAT.  Paperwork was completed and a verbal brief was conducted by the Pilot and Ramp.  Operations Agent was issued the paperwork with applicable signatures.  I made the mistake of not contacting Dispatch to have HAZMAT added to the Release.  I was contacted by Dispatch via ACARS regarding the infraction and we pen/inked the addition at time XA27Z and prior to takeoff.Attention to detail on all parties regarding paperwork and added HAZMAT.
During a late departure taxi out in ZZZ to ZZZ1 we realized the NOTAC wasn't noted on the Release. While we were waiting for our departure sequence; the Captain called and pen/inked it with Dispatch while I monitored Ground Control. We were late and tired from multiple ground stops and airborne holding and diversion planning while trying to get out before we timed out.
Air Carrier flight crew reported Final Flight Release was missing required Hazmat notification. Flight Release was amended prior to departure.