Goal-line technology was required for the first time in the Barclays Premier League at Stamford Bridge on Sunday - and thankfully its debut was successful.
Chelsea were 2-0 up in first-half stoppage time against newly-promoted Hull on Jose Mourinho's return to English football when Hawk-Eye was deployed.
Branislav Ivanovic met Frank Lampard's corner with a firm header hit straight at Hull goalkeeper Allan McGregor, who saved on the line at the second attempt.
Not over the line: Alan McGregor just about keeps the header out, with the system proving so
The referee's watch will only buzz when the ball crosses the goal-line, so it can be safe to assume Jonathan Moss felt no vibrations in a decision which is now out of his hands.
There were no protests from the Chelsea players and Mourinho and Hull counterpart Steve Bruce shared pleasantries as the half came to an end.
Replays also indicated the technology was working and Hawk-Eye's view of the incident was broadcast on television and on the big screen in the ground.