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uVision 5 : Grey underline for some variables.

I have installed uVision5 and have noticed that under some variables there is a grey underline.

//! typedef for u64
typedef unsigned long long u64;
//! typedef for u32
typedef unsigned long u32;
//! typedef for u16
typedef unsigned short u16;

Although the above does not show the problem in this text editor, in uVision5 the "u16" & "u32" both have a grey underline. But "u64" has not.

Where can i find out what this under means?

Thanks in advance.

Regards,

Rowland