diff --git a/Steepfile b/Steepfile
index dcbee96e..970f953b 100644
--- a/Steepfile
+++ b/Steepfile
@@ -8,5 +8,6 @@ target :lib do
   check "lib/lrama/digraph.rb"
   check "lib/lrama/report/duration.rb"
   check "lib/lrama/report/profile.rb"
+  check "lib/lrama/token/type.rb"
   check "lib/lrama/warning.rb"
 end
diff --git a/sig/lrama/lexer/token/type.rbs b/sig/lrama/lexer/token/type.rbs
new file mode 100644
index 00000000..14a17f75
--- /dev/null
+++ b/sig/lrama/lexer/token/type.rbs
@@ -0,0 +1,15 @@
+module Lrama
+  class Lexer
+    class Token
+      attr_accessor type: Type
+      attr_accessor s_value: String
+      attr_accessor alias: String
+      attr_accessor keyword_init: bool
+      class Type
+        attr_accessor id: Integer
+        attr_accessor name: String
+        attr_accessor keyword_init: bool
+      end
+    end
+  end
+end