diff --git a/src/parser/ast.schema.yaml b/src/parser/ast.schema.yaml
index 8f794b5..2211b78 100644
--- a/src/parser/ast.schema.yaml
+++ b/src/parser/ast.schema.yaml
@@ -11,6 +11,7 @@ $defs:
     description: A definition of a node type.
     oneOf:
       - $ref: "#/$defs/StructNodeDefinition"
+      - $ref: "#/$defs/LeafStructNodeDefinition"
       - $ref: "#/$defs/EnumNodeDefinition"
       - $ref: "#/$defs/LeafEnumNodeDefinition"
   StructNodeDefinition:
@@ -26,6 +27,20 @@ $defs:
           $ref: "#/$defs/StructChildDefinition"
     required:
       - children
+  LeafStructNodeDefinition:
+    type: object
+    additionalProperties: false
+    description: A description of a Leaf-Struct node to be built.
+    properties:
+      type:
+        const: leaf_struct
+      children:
+        description: Ordered child fields for this node.
+        items:
+          $ref: "#/$defs/LeafStructChildDefinition"
+    required:
+      - type
+      - children
   EnumNodeDefinition:
     type: object
     additionalProperties: false
@@ -199,6 +214,8 @@ $defs:
         type: string
         enum:
           - parse_number_base
+  LeafStructChildDefinition:
+    # TODO
   EnumChildDefinition:
     description: A definition of an enum node's child. Either a bare rule (string) in Pascal case, or an object.
     oneOf: