diff --git a/general-info/lisp.1 b/general-info/lisp.1
index efc5b3296866d186a423573f48d73d098130a261..4414c75d8103688013756966908924733fb7b2e1 100644
--- a/general-info/lisp.1
+++ b/general-info/lisp.1
@@ -6,7 +6,7 @@
 .\" If you want to use this code or any part of CMU Common Lisp, please contact
 .\" Scott Fahlman or slisp-group@cs.cmu.edu.
 .\"
-.\"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/general-info/lisp.1,v 1.2 1991/10/18 18:25:47 ram Exp $
+.\"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/general-info/lisp.1,v 1.3 1991/12/09 17:02:39 ram Exp $
 .\"
 .\" **********************************************************************
 .\"
@@ -93,8 +93,10 @@ This variable points to the `lib/' directory holding `lisp.core' and other
 files used by Lisp at run-time.  The default is `/usr/misc/.cmucl/lib'.
 .TP
 .BR CMUCL_EMPTYFILE
-If `/tmp' is a "tmpfs" filesystem, then you must setenv CMUCL_EMPTYFILE to a
-pathname that can be used instead of `/tmp/empty'.
+If `df /tmp' shows `swap' as the filesystem for the `/tmp' directory, then you
+have a "tmpfs" filesystem.  In this case, you must setenv CMUCL_EMPTYFILE to
+point into a pathname on a non-TMPFS filesystem that can be used instead of
+`/tmp/empty'.
 .PP
 
 .SH FILES