diff --git a/AGENTS.md b/AGENTS.md
index ed915c7..9080c69 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -24,6 +24,7 @@ lua test/run_tests.lua       # Run all tests
 lua test/test_udt.lua        # Run UDT parser tests
 lua test/test_db.lua         # Run DB parser tests
 lua test/test_fb.lua         # Run FB parser tests
+lua test/test_formatter.lua  # Run formatter tests
 lua test/test_plc_json.lua   # Run plc_json tests
 lua test/test_integration.lua # Run integration tests
 
diff --git a/test/run_tests.lua b/test/run_tests.lua
index ff5f701..4f622ee 100644
--- a/test/run_tests.lua
+++ b/test/run_tests.lua
@@ -28,6 +28,7 @@ local function run_all_tests()
   run_test_file("test_udt.lua")
   run_test_file("test_db.lua")
   run_test_file("test_fb.lua")
+  run_test_file("test_formatter.lua")
   run_test_file("test_plc_json.lua")
   run_test_file("test_integration.lua")