The phrase "marking a first" is a perfectly acceptable phrase in written English.
You can use it when referring to something that is happening for the first time. For example, "This New Year's Eve marks a first for us; it will be our first time celebrating it as a married couple."
It came from the Liverpool supporters, not the Stretford End, its irony marking a first win at Old Trafford under Benítez and another four goals to complete a momentous week.
Emmanuel Jal And Abdel Gadir Salim: Ceasefire (World Music Network) Sudan's hottest rapper teams up with the veteran oud player - marking a first collaboration between acts from the country's north and south.
To hunt, to love, to click: Simon & Schuster will put Ernest Hemingway's entire book list online, marking a first in publishing.
On February 24th , 2005the Mobile Servicing System (MSS) was maneuvred on the International Space Station (ISS) by an operator from the ground for the first time, marking a first in human space flight history.
Typically, Apple's second big launch after their initial one is when the device becomes available in China, but this year China got the new iPhones at the same time as the U.S., the UK and Canada, marking a first for an Apple launch.
The second bit of news is The Fault in Our Stars's lunge into the topmost position, marking a first for Penguin Random House this year.
Shares of Transocean jumped 1.6%, or $1.67, to $108.28, on Friday, marking a second day of strong gains.
Soy products, a Cargill specialty, are of particular interest, with retail sales expected to grow 17% this year, marking a seventh-consecutive year of double-digit gain.
Chinese shares saw the biggest falls in the region with the Shanghai Composite closing down 2.8% at 4,112.21 - marking a third day of declines.
The only fireworks were far in the distance, marking a Fourth of July that neither would celebrate or even care about.
Hundreds of people flooded the streets of downtown Los Angeles on Thursday and marched between City Hall and Staples Center, marking a third night of demonstrations against the election of Donald Trump as president.
