diff --git a/src/EscapeSequenceParser.test.ts b/src/EscapeSequenceParser.test.ts
index c1b58087..d4f3d2f0 100644
--- a/src/EscapeSequenceParser.test.ts
+++ b/src/EscapeSequenceParser.test.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
 import { ParserState, IDcsHandler, IParsingState } from './Types';
 import { EscapeSequenceParser, TransitionTable, VT500_TRANSITION_TABLE } from './EscapeSequenceParser';
 import * as chai from 'chai';
diff --git a/src/EscapeSequenceParser.ts b/src/EscapeSequenceParser.ts
index 81042129..c99d5c6f 100644
--- a/src/EscapeSequenceParser.ts
+++ b/src/EscapeSequenceParser.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
 import { ParserState, ParserAction, IParsingState, IDcsHandler, IEscapeSequenceParser } from './Types';
 
 // number range macro