diff --git a/src/DOM/HTML/Indexed/FormMethod.purs b/src/DOM/HTML/Indexed/FormMethod.purs
index acf5db5..42f1d73 100644
--- a/src/DOM/HTML/Indexed/FormMethod.purs
+++ b/src/DOM/HTML/Indexed/FormMethod.purs
@@ -5,6 +5,7 @@ import Prelude
 data FormMethod
   = POST
   | GET
+  | Dialog
 
 derive instance eqFormMethod :: Eq FormMethod
 derive instance ordFormMethod :: Ord FormMethod
@@ -13,3 +14,4 @@ renderFormMethod :: FormMethod -> String
 renderFormMethod = case _ of
   POST -> "post"
   GET -> "get"
+  Dialog -> "dialog"