diff --git a/doc/asdf.texinfo b/doc/asdf.texinfo
index c8694b242ad4527c713a32580d9acb95202c49a8..7fd118b0ba6a5f48855e5b7e3b88c3eeb6f94895 100644
--- a/doc/asdf.texinfo
+++ b/doc/asdf.texinfo
@@ -1406,7 +1406,7 @@ simple-component-name := string
 pathname-specifier := pathname | string | symbol
 
 method-form := (operation-name qual lambda-list @Arest{} body)
-qual := method qualifier
+qual := method qualifier?
 
 component-dep-fail-option := :fail | :try-next | :ignore