diff --git a/share/man/man1/intro.1 b/share/man/man1/intro.1
index 9a5fd1268ab..070466e7171 100644
--- a/share/man/man1/intro.1
+++ b/share/man/man1/intro.1
@@ -64,6 +64,7 @@ completion of the command.
 .Xr intro 4
 .Xr intro 7
 .Xr intro 8
+.Xr intro 9
 .Pp
 Tutorials in the
 .%T "UNIX User's Manual Supplementary Documents" .