diff --git a/asdf.texinfo b/asdf.texinfo
index cfef5c6..b539182 100644
--- a/asdf.texinfo
+++ b/asdf.texinfo
@@ -339,7 +339,8 @@ option := :components component-list
         | :operation-done-p method-form
         | :depends-on ( {dependency-def}* ) 
 	| :serial [ t | nil ]
-        | :in-order-to ( {dependency}+ )
+        | :in-order-to ( {dependency}+ ) 
+        | :class symbol
 
 component-list := ( {component-def}* )
                 
