Taper one end lof a line

[pambie]

After I have drawn a line with either a pen or brush I want to taper the end of it to nothing.
I have worked out how to taper both ends, but I only want to taper one.
Does anyone know how I can do this?
Thanks

 

[iDad]

Very small eraser tool set at low slowly erase
copy the end work on it as new layer then merge back just an idea

 

[pswift]

Use the liquify tool

 

[hawkeye]

Use the brush engine and set the shape dynamics to fade. Adjust as needed.

 

[storm319]

thanks for a tip