I found this in High School Sweethearts in C# on Exercism.
{<interpolationExpression>[,<alignment>][:<formatString>]}
The alignment specifies the length of the “field” in which the text is placed, padded to the left with spaces if the alignment is negative or to the right if it is positive.
English is not my native language so I’m not sure, but should it be
The alignment specifies the length of the “field” in which the text is placed, padded to the left with spaces if the alignment is positive or to the right if it is negative.
instead?