diff --git a/man/rgbgfx.1 b/man/rgbgfx.1
index 9b45a4ca..b18d27e7 100644
--- a/man/rgbgfx.1
+++ b/man/rgbgfx.1
@@ -498,7 +498,7 @@ When using reverse mode, make sure to pass the same flags that were given when g
 .Fl C , d , N , s , x ,
 and
 .Fl Z .
-.Do At-files Dc may help with this .
+.Do Sx At-files Dc may help with this .
 .Nm
 will warn about any inconsistencies it detects.
 .Pp