B737-800
Flight Crew Air Transport Pilot (ATP)
Deviation - Speed All Types; Inflight Event / Encounter Wake Vortex Encounter
General None Reported / Taken
Environment - Non Weather Related
A momentary overspeed due to sudden onset of wake turbulence occurred at FL380. Airspeed exceedance was 5-7 KTS. Mach .82 did not appear to be exceeded. Aircraft Maintenance was notified via Dispatch. The above information was entered in the logbook.
B737-800 Captain reported a slight overspeed as a result of a wake vortex encounter at FL380.