diff --git a/src/directive.rs b/src/directive.rs
index f240197..31d955b 100644
--- a/src/directive.rs
+++ b/src/directive.rs
@@ -9,13 +9,13 @@ pub struct Directive {
     /// Fixed prefix term.
     prefix: String,
     /// The type of the prefix argument, if there is one.
-    prefix_arg: Option<Type>,
+    prefix_arg: Option<Param>,
     /// Fixed infix term.
     /// Can only be present if the prefix argument exists.
     infix: Option<String>,
     /// The type of the infix argument.
     /// Can only be present if the infix term exists.
-    infix_arg: Option<Type>,
+    infix_arg: Option<Param>,
     /// Fixed suffix term.
     /// Can only be present if the infix argument exists.
     /// Note that this implies directives which have two terms have a prefix
@@ -23,37 +23,21 @@ pub struct Directive {
     suffix: Option<String>,
     /// The type of the suffix argument.
     /// Can only be present if the suffix exists.
-    suffix_arg: Option<Type>,
+    suffix_arg: Option<Param>,
     /// The type of the elements of the list argument, if supported.
-    list_arg: Option<Type>,
+    list_arg: Option<Param>,
     // TODO(zeph): macro expansion?
 }
 
-/// Directive parameter type.
-pub enum Type {
-    Named {
-        name: String,
-        doc: String,
-        underlying: Param,
-    },
-    Literal(Param),
-}
-
-impl Type {
-    pub fn underlying(&self) -> &Param {
-        match self {
-            Self::Named {
-                underlying,
-                name: _,
-                doc: _,
-            } => underlying,
-            Self::Literal(underlying) => underlying,
-        }
-    }
+/// Directive parameter.
+pub struct Param {
+    name: String,
+    doc: String,
+    typ: Type,
 }
 
 /// Types expected by directive arguments.
-pub enum Param {
+pub enum Type {
     /// Arbitrary text.
     Text,
     /// Speech text, possibly containing emphasis, shout, or whisper markers.
@@ -72,10 +56,4 @@ pub enum Param {
 mod tests {
     use super::*;
     use rstest::rstest;
-
-    const DIRECTIVE_JSON: &str = r#"{
-		"name": "kessoku",
-		"prefix": "bocchi",
-		"prefix_arg": 
-	}"#;
 }