Index: /trunk/doc/pslib/psLibSDRS.tex
===================================================================
--- /trunk/doc/pslib/psLibSDRS.tex	(revision 27848)
+++ /trunk/doc/pslib/psLibSDRS.tex	(revision 27849)
@@ -7449,8 +7449,10 @@
 \end{prototype}
 
-The following function changes the given rotation to its inverse:
-
-\begin{prototype}
-psSphereRot *psSphereRotInvert(psSphereRot *rot);
+The following function constructs a the \code{psSphereRot} with the
+inverse rotation of the given euler angles.  This is equivalent to
+applying \code{psSphereRotConjugate} on a \code{psSphereRot} object:
+
+\begin{prototype}
+psSphereRot *psSphereRotInvert(double alphaP, double deltaP, double phiP);
 \end{prototype}