diff --git a/corpus/definitions.txt b/corpus/definitions.txt
index 9ad29f62b..7a4e3ebf2 100644
--- a/corpus/definitions.txt
+++ b/corpus/definitions.txt
@@ -399,6 +399,9 @@ Class definitions with parameters
 
 class Point(val x: Int, val y: Int)(implicit coord: Coord)
 
+// TODO: The last argument should become class_parameters
+class A @Inject()(x: Int, y: Int)
+
 ---
 
 (compilation_unit
@@ -408,7 +411,16 @@ class Point(val x: Int, val y: Int)(implicit coord: Coord)
       (class_parameter (identifier) (type_identifier))
       (class_parameter (identifier) (type_identifier)))
     (class_parameters
-      (class_parameter (identifier) (type_identifier)))))
+      (class_parameter (identifier) (type_identifier))))
+  (comment)
+  (class_definition
+    (identifier)
+    (annotation
+     (type_identifier)
+     (arguments)
+     (arguments
+       (ascription_expression (identifier) (type_identifier))
+       (ascription_expression (identifier) (type_identifier))))))
 
 =======================================
 Class definitions with parameters (Scala 3 syntax)
@@ -416,6 +428,15 @@ Class definitions with parameters (Scala 3 syntax)
 
 class Point(val x: Int, val y: Int)(using coord: Coord)
 
+// TODO: The last argument should become class_parameters
+class A @ann (x: Int, y: Int)
+
+// TODO: The last argument should become class_parameters
+class A @ann(1) (x: Int, y: Int)
+
+// TODO: The last argument should become class_parameters
+class A @ann(1)(1) (x: Int, y: Int)
+
 ---
 
 (compilation_unit
@@ -425,7 +446,35 @@ class Point(val x: Int, val y: Int)(using coord: Coord)
       (class_parameter (identifier) (type_identifier))
       (class_parameter (identifier) (type_identifier)))
     (class_parameters
-      (class_parameter (identifier) (type_identifier)))))
+      (class_parameter (identifier) (type_identifier))))
+  (comment)
+  (class_definition
+    (identifier)
+    (annotation
+     (type_identifier)
+     (arguments
+       (ascription_expression (identifier) (type_identifier))
+       (ascription_expression (identifier) (type_identifier)))))
+  (comment)
+  (class_definition
+    (identifier)
+    (annotation
+     (type_identifier)
+     (arguments (integer_literal))
+     (arguments
+       (ascription_expression (identifier) (type_identifier))
+       (ascription_expression (identifier) (type_identifier)))))
+  (comment)
+  (class_definition
+    (identifier)
+    (annotation
+     (type_identifier)
+     (arguments (integer_literal))
+     (arguments (integer_literal))
+     (arguments
+       (ascription_expression (identifier) (type_identifier))
+       (ascription_expression (identifier) (type_identifier)))))
+)
 
 =======================================
 Modifiers
diff --git a/grammar.js b/grammar.js
index 95acdc7ab..88141f165 100644
--- a/grammar.js
+++ b/grammar.js
@@ -254,10 +254,12 @@ module.exports = grammar({
 
     /**
      * ClassConstr       ::=  [ClsTypeParamClause] [ConstrMods] ClsParamClauses
+     * ConstrMods        ::=  {Annotation} [AccessModifier]
      */
     _class_constructor: $ => prec.right(seq(
       field('name', $._identifier),
       field('type_parameters', optional($.type_parameters)),
+      optional($.annotation),
       optional($.access_modifier),
       field('class_parameters', repeat($.class_parameters)),
     )),