--- ray/doc/ray.1	2008/04/30 22:00:28	1.14
+++ ray/doc/ray.1	2010/03/12 18:34:43	1.15
@@ -491,7 +491,7 @@ a perfectly scattering medium (no absorption).
 The scattering eccentricity parameter will likewise override the global
 setting if it is present.
 Scattering eccentricity indicates how much scattered light favors the
-forward direction, as fit by the Heyney-Greenstein function:
+forward direction, as fit by the Henyey-Greenstein function:
 .DS
 P(theta) = (1 - g*g) / (1 + g*g - 2*g*cos(theta))^1.5
 .DE