diff --git a/usr.sbin/lpr/common_source/ctlinfo.c b/usr.sbin/lpr/common_source/ctlinfo.c
index 5665154705a4..6d0802519a29 100644
--- a/usr.sbin/lpr/common_source/ctlinfo.c
+++ b/usr.sbin/lpr/common_source/ctlinfo.c
@@ -183,20 +183,26 @@ __END_DECLS
  *
  *	The following indicate actions to take on a given datafile.  The same
  *	datafile may appear on more than one "print this file" command in the
- *	control file.  Note that ALL ids with lowercase letters are commands
- *	to "print this file":
+ *	control file.  Note that ALL ids with lowercase letters are expected
+ *	to be actions to "print this file":
  *
- *	  f   - "file name", a plain-text file to print
- *	  l   - "file name", text file with control chars to print (some
- *		printers recognize this id as a request to print a
- *		postscript file)
- *	  p   - "file name", text file to print with pr(1)
- *	  t   - "file name", troff(1) file to print
- *	  n   - "file name", ditroff(1) file to print
- *	  d   - "file name", dvi file to print
- *	  g   - "file name", plot(1G) file to print
+ *	  c   - "file name", cifplot file to print.  This action appears
+ *		when the user has requested 'lpr -c'.
+ *	  d   - "file name", dvi file to print, user requested 'lpr -d'
+ *	  f   - "file name", a plain-text file to print = "standard"
+ *	  g   - "file name", plot(1G) file to print, ie 'lpr -g'
+ *	  l   - "file name", text file with control chars which should
+ *		be printed literally, ie 'lpr -l'  (note: some printers
+ *		take this id as a request to print a postscript file)
+ *	  n   - "file name", ditroff(1) file to print, ie 'lpr -n'
+ *	  o   - "file name", a postscript file to print.  This id is
+ *		described in the original RFC, but not much has been
+ *		done with it.  This 'lpr' does not generate control
+ *		lines with 'o'-actions, but lpd's printjob processing
+ *		will treat it the same as 'f'.
+ *	  p   - "file name", text file to print with pr(1), ie 'lpr -p'
+ *	  t   - "file name", troff(1) file to print, ie 'lpr -t'
  *	  v   - "file name", plain raster file to print
- *	  c   - "file name", cifplot file to print
  *
  *	  U   - "file name" of datafile to unlink (ie, remove file
  *		from spool directory.  To be done in a 'Pass 2',
diff --git a/usr.sbin/lpr/lpd/printjob.c b/usr.sbin/lpr/lpd/printjob.c
index 91c03c305885..d81ce58b2657 100644
--- a/usr.sbin/lpr/lpd/printjob.c
+++ b/usr.sbin/lpr/lpd/printjob.c
@@ -408,6 +408,8 @@ printit(struct printer *pp, char *file)
 	 *		R -- laser dpi "resolution"
 	 *              f -- "file name" name of text file to print
 	 *		l -- "file name" text file with control chars
+	 *		o -- "file name" postscript file, according to
+	 *		     the RFC.  Here it is treated like an 'f'.
 	 *		p -- "file name" text file to print with pr(1)
 	 *		t -- "file name" troff(1) file to print
 	 *		n -- "file name" ditroff(1) file to print
@@ -626,7 +628,7 @@ print(struct printer *pp, int format, char *file)
 		pp->tof = 1;
 	}
 	if (pp->filters[LPF_INPUT] == NULL
-	    && (format == 'f' || format == 'l')) {
+	    && (format == 'f' || format == 'l' || format == 'o')) {
 		pp->tof = 0;
 		while ((n = read(fi, buf, BUFSIZ)) > 0)
 			if (write(ofd, buf, n) != n) {
@@ -674,6 +676,14 @@ print(struct printer *pp, int format, char *file)
 			return(ERROR);
 		}
 		fi = p[0];			/* use pipe for input */
+	case 'o':	/* print postscript file */
+		/*
+		 * For now, treat this as a plain-text file, and assume
+		 * the standard LPF_INPUT filter will recognize that it
+		 * is postscript and know what to do with it.  These
+		 * 'o'-file requests could come from MacOS 10.1 systems.
+		 */
+		/* FALLTHROUGH */
 	case 'f':	/* print plain text file */
 		prog = pp->filters[LPF_INPUT];
 		av[1] = width;