diff --git a/src/vs/languages/html/common/OSSREADME.json b/src/vs/languages/html/common/OSSREADME.json
new file mode 100644
index 0000000000000000000000000000000000000000..c98b0eb80a994ae2bba51d5a769385b448a7e2ef
--- /dev/null
+++ b/src/vs/languages/html/common/OSSREADME.json
@@ -0,0 +1,19 @@
+// ATTENTION - THIS DIRECTORY CONTAINS THIRD PARTY OPEN SOURCE MATERIALS:
+[{
+	"name": "HTML 5.1 W3C Working Draft",
+	"version": "08 October 2015",
+	"license": "W3C Document License",
+	"repositoryURL": "http://www.w3.org/TR/2015/WD-html51-20151008/",
+	"licenseDetail": [
+		"Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang). This software or document includes material copied ",
+		"from or derived from HTML 5.1 W3C Working Draft (http://www.w3.org/TR/2015/WD-html51-20151008/.)",
+		"",
+		"THIS DOCUMENT IS PROVIDED \"AS IS,\" AND COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT ",
+		"NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR TITLE; THAT THE CONTENTS OF ",
+		"THE DOCUMENT ARE SUITABLE FOR ANY PURPOSE; NOR THAT THE IMPLEMENTATION OF SUCH CONTENTS WILL NOT INFRINGE ANY THIRD PARTY ",
+		"PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.",
+		"",
+		"COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE ",
+		"DOCUMENT OR THE PERFORMANCE OR IMPLEMENTATION OF THE CONTENTS THEREOF."
+	]
+}]
diff --git a/src/vs/languages/html/common/htmlTags.ts b/src/vs/languages/html/common/htmlTags.ts
index b25b73f685d5a0c6fb08482be2fc44dd6cc322c0..f7dac0d6972146a622a8d6ad9fdd38056fe2dc64 100644
--- a/src/vs/languages/html/common/htmlTags.ts
+++ b/src/vs/languages/html/common/htmlTags.ts
@@ -2,6 +2,10 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
+/*---------------------------------------------------------------------------------------------
+ *  Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang). This document includes material copied
+ *  from or derived from HTML 5.1 W3C Working Draft (http://www.w3.org/TR/2015/WD-html51-20151008/.)"
+ *--------------------------------------------------------------------------------------------*/
 
 import strings = require('vs/base/common/strings');
 import arrays = require('vs/base/common/arrays');