added back dash that was removed in merge

paper/paper.md

@@ -27,7 +27,7 @@ In general relativity, the motion of a free-falling test particle in a curved sp
 described by a timelike geodesic - the minimal path between two points in space. 
 Intuitively, geodesics are analogous to straight line paths in flat spacetime.
 The timelike geodesics of Kerr spacetime are of particular interest in the field of black 
-hole perturbation theory because they describe the zeroth order motion of a small object 
+hole perturbation theory because they describe the zeroth-order motion of a small object 
 moving through the background spacetime of a much more massive spinning black hole. For this reason, computing
 geodesics is an important step in modeling the gravitational radiation emitted by an
 extreme-mass-ratio inspiral (EMRI) - an astrophysical binary in which a stellar mass