You used to see it in Ansett on ICAO A noise abatement procedures in Sydney.
In the take-off mode for the flight director, the FD will command MCP speed (bugged at V2) + 20 knots (after achieving sufficient climb that is).
As the ICAO A noise abatement requires that you maintain V2 + 10 to +20 until 1500 ft, and max V2 + 20 to 3000 the flight director is set correctly.
Although the manual bugs on the ASI are set, with one at V2 + 15, the speed tape only shows the magenta mark at MCP speed (V2). Asking for "Bug one click" resets the MCP Speed bug on the speed tape to the target speed you are looking for, matching the command you are recieving from the Flight Director.
As the climb to 3000' takes a while, it is a good thing to have the speed tape bug and flight director commands agree, on other take-offs it isn't necessary, as you usually select a speed mode before the FD hits the V2 +20 limit in any case.