Help, what have I done wrong?

I've written a library to manage a NeoPixel ring controlling fading in and out, it worked fine.

Then I though I would add a method to add the NeoPixel object definition as a pointer to the class. I added the method prototype to my class definition:

 void     setNeoPixels(Adafruit_NeoPixel* pobjNeoPixels, uint8_t u8NumPixels);

And included the header:

#include <Adafruit_NeoPixel.h>

At the top of my class header file.

When I try to verify the project I get:

In file included from ring-demo.ino:1:0:
D:\Program Files (x86)\Arduino\libraries\clsFader/clsFader.h:37:33: fatal error: Adafruit_NeoPixel.h: No such file or directory
   #include <Adafruit_NeoPixel.h>
                                 ^
compilation terminated.
Error compiling.

What have I done wrong?

Nevermind, I was able to fix it by using a relative path.

#include "../Adafruit_NeoPixel/Adafruit_NeoPixel.h"