diff --git a/TODO.md b/TODO.md
index 9c853b30..dafc5ace 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,4 +1,3 @@
-[builtin] `Builtin` -- syntax
 [builtin] add `@` as prefix to all builtins
 [builtin] remove `isPrivate` from Definition
 
diff --git a/src/lang/syntax/grammars/word.ts b/src/lang/syntax/grammars/word.ts
index 2b72460d..422c5b56 100644
--- a/src/lang/syntax/grammars/word.ts
+++ b/src/lang/syntax/grammars/word.ts
@@ -1,6 +1,7 @@
 export const word = {
   $grammar: {
     "word:call": [{ name: "variable_name" }],
+    "word:builtin": ['"@"', { name: "variable_name" }],
     "word:local": ['"$"', { name: "variable_name" }],
     "word:port_push": [
       '"("',
diff --git a/src/lang/syntax/matchers/word_matcher.ts b/src/lang/syntax/matchers/word_matcher.ts
index 9e4fd6d9..3ed1bb6f 100644
--- a/src/lang/syntax/matchers/word_matcher.ts
+++ b/src/lang/syntax/matchers/word_matcher.ts
@@ -10,6 +10,12 @@ export function word_matcher(tree: pt.Tree): Word {
       name: pt.str(name),
       span,
     }),
+    "word:builtin": ({ name }, { span }) => ({
+      "@type": "Word",
+      "@kind": "Builtin",
+      name: pt.str(name),
+      span,
+    }),
     "word:local": ({ name }, { span }) => ({
       "@type": "Word",
       "@kind": "Local",