--- ray/doc/man/man1/rtrace.1	2009/12/13 19:13:03	1.19
+++ ray/doc/man/man1/rtrace.1	2010/01/26 04:42:16	1.20
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rtrace.1,v 1.19 2009/12/13 19:13:03 greg Exp $"
+.\" RCSid "$Id: rtrace.1,v 1.20 2010/01/26 04:42:16 greg Exp $"
 .TH RTRACE 1 10/17/97 RADIANCE
 .SH NAME
 rtrace - trace rays in RADIANCE scene
@@ -543,7 +543,8 @@ source within a given scattering volume.
 .TP
 .BI -lr \ N
 Limit reflections to a maximum of
-.I N.
+.I N,
+if N is a positive integer.
 If
 .I N
 is zero or negative, then Russian roulette is used for ray
@@ -551,7 +552,7 @@ termination, and the
 .I -lw
 setting (below) must be positive.
 If N is a negative integer, then this sets the upper limit
-of reflections past which Russian roulette will not be used.
+of reflections past which Russian roulette will be used.
 In scenes with dielectrics and total internal reflection,
 a setting of 0 (no limit) may cause a stack overflow.
 .TP