I am trying to create a NSMutableArray by reading in a .txt file and am having trouble setting the last element of the array to nil.

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"namelist" ofType:@"txt"];
NSString *data = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSArray *list = [data componentsSeparatedByString:@"\n"];
NSMutableArray *mutableList = [[NSMutableArray alloc] initWithArray:list];

I wanted to use NSMutableArray's function addObject, but that will not allow me to add nil. I also tried:

[mutableList addObject:[NSNull null]];

but that does not seem to work either. Is there a way around this problem?