I agree with you. See below (I have added [is?] in brackets, because it seems to be missing in order for the text to make sense).

Reference Frames
A reference frame is a particular perspective employed by the analyst to describe and/or observe a motion effectively. There are different types of reference frames. A fixed frame is a reference frame that is fixed. A moving frame is a reference frame that moves with the body. A moving reference frame can translate and/or rotate. When a reference frame is either fixed or moving with a constant velocity, it is an inertial frame. An accelerating reference frame is a non-inertial frame. **A fixed reference frame** [is?] fixed to the environment, not to the moving subject, and used commonly in describing the motions of different body parts is the global frame while all the reference frames fixed to the moving body parts are called the local frames.
www.kwon3d.com/theory/transform/refrm.html