Index: src/library/base/man/on.exit.Rd
===================================================================
--- src/library/base/man/on.exit.Rd	(revision 36611)
+++ src/library/base/man/on.exit.Rd	(working copy)
@@ -19,7 +19,8 @@
 \arguments{
   \item{expr}{an expression to be executed.}
   \item{add}{if TRUE, add \code{expr} to be executed after any previously
-    set expressions.}
+    set expressions; otherwise (the default) \code{expr} will overwrite
+    any previously set expressions.}
 }
 \references{
   Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
@@ -27,7 +28,9 @@
   Wadsworth \& Brooks/Cole.
 }
 \seealso{
-  \code{\link{sys.on.exit}} to see the current expression.
+  \code{\link{sys.on.exit}} which returns the expression stored for use
+  by \code{on.exit()} in the function in which \code{sys.on.exit()} is
+  evaluated.  
 }
 \examples{
 opar <- par(mai = c(1,1,1,1))