--- ray/doc/man/man1/icalc.1	2004/01/01 19:31:45	1.1
+++ ray/doc/man/man1/icalc.1	2019/06/10 13:56:52	1.4
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: icalc.1,v 1.1 2004/01/01 19:31:45 greg Exp $"
+.\" RCSid "$Id: icalc.1,v 1.4 2019/06/10 13:56:52 greg Exp $"
 .TH ICALC 1 2/3/95 RADIANCE
 .SH NAME
 icalc - interactive calculator
@@ -13,7 +13,7 @@ is a algebraic calculator designed primarily for
 interactive use.
 Each formula definition
 .I file
-is read and compiled.
+is read and compiled from the RADIANCE library where it is found.
 The standard input is then read, expressions are evaluated
 and results are sent to the standard output.
 If a newline is escaped using a backslash, input is continued
@@ -103,6 +103,12 @@ is zero, the number of available arguments is returned
 .BR "rand(x)"
 compute a random number between 0 and 1 based on x.
 .TP
+.BR "min(a1, a2, ..)"
+return the minimum value from a list of arguments.
+.TP
+.BR "max(a1, a2, ..)"
+return the maximum value from a list of arguments.
+.TP
 .BR "floor(x)"
 return largest integer not greater than x.
 .TP
@@ -128,7 +134,9 @@ trigonometric functions.
 inverse trigonometric functions.
 .TP
 .BR "atan2(y, x)"
-inverse tangent of y/x (range -pi to pi).
+inverse tangent of y/x (range \-pi to pi).
+.SH ENVIRONMENT
+RAYPATH		the directories to check for auxiliary files.
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"