add note about html
diff --git a/man/man1/man.1 b/man/man1/man.1
index c35c739..ec35b7a 100644
--- a/man/man1/man.1
+++ b/man/man1/man.1
@@ -119,3 +119,11 @@
 .I tbl
 and/or
 .IR eqn .
+.PP
+The HTML manual is not maintained automatically.
+To update it:
+.IP
+.EX
+cd \*9/dist
+mk man
+.EE