diff --git a/packages/@lwc/template-compiler/src/codegen/expression.ts b/packages/@lwc/template-compiler/src/codegen/expression.ts
index 3fe2b83157..0721162ea7 100644
--- a/packages/@lwc/template-compiler/src/codegen/expression.ts
+++ b/packages/@lwc/template-compiler/src/codegen/expression.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+ */
+
 import { walk } from 'estree-walker';
 import * as t from '../shared/estree';
 import { ComplexExpression } from '../shared/types';
diff --git a/packages/@lwc/template-compiler/src/parser/expression-complex/html.ts b/packages/@lwc/template-compiler/src/parser/expression-complex/html.ts
index 100841f1aa..c607c03097 100644
--- a/packages/@lwc/template-compiler/src/parser/expression-complex/html.ts
+++ b/packages/@lwc/template-compiler/src/parser/expression-complex/html.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+ */
+
 import { parseExpressionAt } from 'acorn';
 import { Document, DocumentFragment, ParsingError, ParserOptions } from 'parse5';
 import { ParserDiagnostics, invariant } from '@lwc/errors';
diff --git a/packages/@lwc/template-compiler/src/parser/expression-complex/index.ts b/packages/@lwc/template-compiler/src/parser/expression-complex/index.ts
index 199f5722e6..aa8e4ceb39 100644
--- a/packages/@lwc/template-compiler/src/parser/expression-complex/index.ts
+++ b/packages/@lwc/template-compiler/src/parser/expression-complex/index.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+ */
+
 export * from './types';
 export * from './validate';
 export * from './html';
diff --git a/packages/@lwc/template-compiler/src/parser/expression-complex/types.ts b/packages/@lwc/template-compiler/src/parser/expression-complex/types.ts
index e613563d61..711abb093c 100644
--- a/packages/@lwc/template-compiler/src/parser/expression-complex/types.ts
+++ b/packages/@lwc/template-compiler/src/parser/expression-complex/types.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+ */
+
 import type { Node as AcornNode } from 'acorn';
 
 type StartingIdx = number;
diff --git a/packages/@lwc/template-compiler/src/parser/expression-complex/validate.ts b/packages/@lwc/template-compiler/src/parser/expression-complex/validate.ts
index 09a9df686a..3cb2026c1a 100644
--- a/packages/@lwc/template-compiler/src/parser/expression-complex/validate.ts
+++ b/packages/@lwc/template-compiler/src/parser/expression-complex/validate.ts
@@ -1,3 +1,10 @@
+/*
+ * Copyright (c) 2023, salesforce.com, inc.
+ * All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
+ */
+
 import { ParserDiagnostics, invariant } from '@lwc/errors';
 import { walk } from 'estree-walker';
 import * as t from '../../shared/estree';