--- man/nonlinear/derivative.man.orig	Thu Aug  9 09:31:56 2001
+++ man/nonlinear/derivative.man	Thu Aug  9 10:08:41 2001
@@ -2,5 +2,5 @@
 .so ../sci.an 
 .SH NAME
-derivative- approximate derivative
+derivative - approximate derivative
 .SH CALLING SEQUENCE
 .nf
