diff --git a/doc/man/man1/pabopto2bsdf.1 b/doc/man/man1/pabopto2bsdf.1
index b175d21f..95cfce4e 100644
--- a/doc/man/man1/pabopto2bsdf.1
+++ b/doc/man/man1/pabopto2bsdf.1
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: pabopto2bsdf.1,v 1.3 2021/03/03 19:14:51 greg Exp $"
+.\" RCSid "$Id: pabopto2bsdf.1,v 1.4 2021/03/26 19:48:22 greg Exp $"
 .TH PABOPTO2BSDF 1 2/24/2021 RADIANCE
 .SH NAME
 pabopto2bsdf - convert BSDF measurements to a scattering interpolant representation
@@ -252,7 +252,7 @@ In the
 utility, the world coordinate system follows trigonometric
 conventions with theta=0 aligning to the Z-axis,
 the X-axis matches (theta,phi)=(90,0), and the Y-axis
-is has (theta,phi)=(90,90).
+corresponds to (theta,phi)=(90,90).
 The latter is thought of as the "up" direction for the sample.
 This usually needs to be rotated into position, since most
 RADIANCE models use the Z-axis as the world "up" direction.