B737-800
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 105; Flight Crew Type 10000
Communication Breakdown
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Hazardous Material Violation
Flight Crew Overcame Equipment Problem
Human Factors
During the turn in ZZZ; the Ops Agent informed me of HAZMAT onboard and gave me the copies of the NOTAC. I signed both copies and returned one to the Ops Agent. I forgot to call Dispatch and amend my Release to indicate HAZMAT onboard before I departed ZZZ. En route to ZZZ1; I realized my mistake and sent an ACARS message to Dispatch to inform them that I had HAZMAT onboard. Dispatch responded and we did a pen and ink change to amend the Release to show the remark - HAZMAT on Flight-Refer to NOTAC.
During boarding; the Captain was notified of HAZMAT aboard the aircraft and given the appropriate NOTAC forms from our Ops Agent. I was briefed on the HAZMAT and reviewed the signed NOTAC form. My expectation bias and fatigue likely contributed to not backing up the Captain contacting Dispatch to get the appropriate 'HAZMAT  of flight - Refer to NOTAC' pen and ink amendment on the Dispatch Release prior to takeoff. The Captain recognized the error en route and coordinated with Dispatch to correct the issue.
B737-800 flight crew reported the Final Flight Release was not amended to indicate Hazmat onboard prior to departure. The flight release error was due to a communications breakdown between flight crew and Dispatch.