diff --git a/man/rgblink.1 b/man/rgblink.1
index 9d0d16c1..15ede47d 100644
--- a/man/rgblink.1
+++ b/man/rgblink.1
@@ -308,6 +308,13 @@ Later region specs override earlier ones; for example,
 disables scrambling for
 .Cm romx .
 .Pp
+The arguments to multiple
+.Fl S
+options are processed as if concatenated; for example,
+.Fl S Cm romx=16 Fl S Cm wramx=8 Fl S Cm sram=4
+will work the same as
+.Fl S Cm romx=16,wramx=8,sram=4 .
+.Pp
 .Cm wramx
 scrambling is silently ignored if
 .Fl w