B737 Undifferentiated or Other Model
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 150
Communication Breakdown; Time Pressure; Workload
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Human Factors
The Ops Agent arrived in the cockpit just prior to push time and provided me with a NOTAC (Notice to Captain) to sign. I looked over the NOTAC. Everything looked appropriate; the correct flight number and city pair and date. What I failed to do was to call Dispatch and amend/add HAZMAT (hazardous material)/ COMAT (company material)-ONBOARD to the release. I realized my error upon arrival in ZZZ1; at which point I contacted my Dispatcher.
B-737 Captain reported departure without without amended Release for late Comat Hazmat addition.