Even Donald Trump knows it's far from a touchdown.
The handshake was historic, to be sure, "very important in world history," he says.
But the deal's not done, and he knows he still has to "get the ball over the goal line".
There have been good reasons for United States presidents not to meet North Korean leaders in the past, namely the regime's penchant for cheating, and the fact that talks like this validate a regime that imprisons, tortures and murders its own people.
There's something uncomfortable about the North Korean leader being feted on the world stage and honoured by the US President when there are hundreds of thousands in prison camps at home.
That said, Mr Trump's now "personal relationship" with Kim Jong-un may kickstart eventual denuclearisation and improved human rights in North Korea simply because direct engagement is best, especially when dealing with dictators who crave attention.
Plainly it suits Mr Trump, who likes to act unilaterally himself, however "eventual" progress is the operative word.
The piece of paper signed by Mr Trump and Mr Kim doesn't take things forward much.
A commitment to "complete denuclearisation" merely reaffirms what North Korea agreed to at the summit with the South in April.
No timeframe has been added, other than "as soon as possible" according to the President, who admits it could take years.
There's also no clearer definition of denuclearisation and whether the US would have to withdraw its troops from South Korea and remove its nuclear umbrella over the region to satisfy Mr Kim that he can give away his ultimate protection — and his leverage.
Let's not forget that it's the nuclear weapons that give Mr Kim the power.
Mr Trump says he eventually wants to bring the US troops in South Korea home anyway, and he's going to cancel war games held between the US and South Korea because they're "expensive" and "provocative".
That's a concession, plain and simple.
Vague statements about new, more normalised relations and working for stable peace are also pretty meaningless without the denuclearisation timetable and a plan for complete, verifiable, irreversible action on that front.
Not to say the meeting was a failure — far from it.
Mr Trump and more to the point his team, including Secretary of State Mike Pompeo, deserve credit for getting Mr Kim on a plane out of his hermit kingdom.
Much as the President's observations about the great beaches and real estate potential in North Korea caused a collective global eyeroll, he's not wrong.
Getting the North Korean leader to Singapore enabled him to see what his country could become if he behaves sufficiently to get sanctions relaxed and investment in.
Singapore itself transformed from an island with no natural assets into an economic powerhouse under another hardman, Lee Kuan Yew, after it broke away from Malaysia in the 1970s.
North Korea is far richer in raw potential.
For all of the bluster and flag waving (not to mention the bizarre sight of North Korean flags grouped with the stars and stripes), what this meeting proved is that there's lots of work to do.
The potential for a deal is there.
Mr Kim, whatever his motives, is playing along for the moment.
It's now going to take some good old-fashioned legwork by actual negotiators to nail down what denuclearisation means for both sides, in what timeframe it can be done, and how to make sure North Korea doesn't cheat (again).
In a world full of the desire for instant gratification, the summit may appear to have come up short, but it's opened a dialogue.
Now it's time to talk detail, to get a deal that will stick.