For years people have used all sorts of things to explain the offside rule -- but now all you need is a 50 pence piece.
That's because the Royal Mint have released a coin with a diagram explaining the rule to celebrate the London 2012 Olympics.
Designed by Neil Wolfson the 50p coin features a diagram of a football pitch with markers showing when a player is, or isn't, offside.
He came up with the idea after hearing that the Royal Mint wanted members of the public to suggest designs for a series of new sporting 50p coins.
Other olympic coinage includes ones featuring rowing, cycling, basketball and archery.
That's because the Royal Mint have released a coin with a diagram explaining the rule to celebrate the London 2012 Olympics.
Designed by Neil Wolfson the 50p coin features a diagram of a football pitch with markers showing when a player is, or isn't, offside.
He came up with the idea after hearing that the Royal Mint wanted members of the public to suggest designs for a series of new sporting 50p coins.
Other olympic coinage includes ones featuring rowing, cycling, basketball and archery.