diff --git a/jsphere/latlon2xyz.m b/jsphere/latlon2xyz.m
index 5c0927a..9290a32 100644
--- a/jsphere/latlon2xyz.m
+++ b/jsphere/latlon2xyz.m
@@ -11,7 +11,7 @@
 %
 %   The Cartesian coordinate system is a right-handed system whose
 %   origin lies at the center of the sphere.  It is oriented with the 
-%   Z-axis passing though the poles and the X-axis passing through
+%   Z-axis passing through the poles and the X-axis passing through
 %   the point LAT=0, LON=0.  
 %
 %   By default, the radius of the sphere is taken as RADEARTH.