diff --git a/intl/chardet/public/MANIFEST b/intl/chardet/public/MANIFEST
index 53aae9318f22..97d4734daa65 100644
--- a/intl/chardet/public/MANIFEST
+++ b/intl/chardet/public/MANIFEST
@@ -8,3 +8,4 @@ nsIStringCharsetDetector.h
 nsIXMLEncodingService.h
 nsMetaCharsetCID.h
 nsXMLEncodingCID.h
+nsIDocumentCharsetInfo.h
diff --git a/intl/chardet/public/Makefile.in b/intl/chardet/public/Makefile.in
index 74989d974d60..574de49aad44 100644
--- a/intl/chardet/public/Makefile.in
+++ b/intl/chardet/public/Makefile.in
@@ -39,6 +39,7 @@ EXPORTS		= \
 		nsIXMLEncodingService.h \
 		nsMetaCharsetCID.h \
 		nsXMLEncodingCID.h \
+		nsIDocumentCharsetInfo.h \
 		$(NULL)
 
 EXPORTS		:= $(addprefix $(srcdir)/, $(EXPORTS))
diff --git a/intl/chardet/public/makefile.win b/intl/chardet/public/makefile.win
index e71e49e430d1..2ad5cabc18a5 100644
--- a/intl/chardet/public/makefile.win
+++ b/intl/chardet/public/makefile.win
@@ -33,6 +33,7 @@ EXPORTS = \
 	nsIXMLEncodingService.h \
 	nsMetaCharsetCID.h \
 	nsXMLEncodingCID.h \
+	nsIDocumentCharsetInfo.h \
         $(NULL)
 
 MODULE=chardet
diff --git a/intl/chardet/public/nsIDocumentCharsetInfo.h b/intl/chardet/public/nsIDocumentCharsetInfo.h
new file mode 100644
index 000000000000..b4957bb840b0
--- /dev/null
+++ b/intl/chardet/public/nsIDocumentCharsetInfo.h
@@ -0,0 +1,37 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ */
+
+#ifndef nsIDocumentCharsetInfo_h__
+#define nsIDocumentCharsetInfo_h__
+#include "nsISupports.h"
+
+
+// {2D40B291-01E1-11d4-9D0E-0050040007B2}
+#define NS_IDOCUMENTCHARSETINFO_IID \
+{ 0x2d40b291, 0x1e1, 0x11d4, { 0x9d, 0xe, 0x0, 0x50, 0x4, 0x0, 0x7, 0xb2 } }
+
+class nsIDocumentCharsetInfo : public nsISupports {
+public:
+  NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDOCUMENTCHARSETINFO_IID)
+};
+
+#endif // nsIDocumentCharsetInfo_h__