diff --git a/include/mshtmdid.h b/include/mshtmdid.h
index c6b98a480d6..579facefe08 100644
--- a/include/mshtmdid.h
+++ b/include/mshtmdid.h
@@ -2054,6 +2054,19 @@
 #define DISPID_IHTMLTABLECAPTION_ALIGN   STDPROPID_XOBJ_BLOCKALIGN
 #define DISPID_IHTMLTABLECAPTION_VALIGN  DISPID_A_TABLEVALIGN
 
+ /* IHTMLCommentElement */
+#define DISPID_IHTMLCOMMENTELEMENT_TEXT    DISPID_COMMENTPDL+1
+#define DISPID_IHTMLCOMMENTELEMENT_ATOMIC  DISPID_COMMENTPDL+2
+
+ /* IHTMLCommentElement2 */
+#define DISPID_IHTMLCOMMENTELEMENT2_DATA           DISPID_COMMENTPDL+3
+#define DISPID_IHTMLCOMMENTELEMENT2_LENGTH         DISPID_COMMENTPDL+4
+#define DISPID_IHTMLCOMMENTELEMENT2_SUBSTRINGDATA  DISPID_COMMENTPDL+5
+#define DISPID_IHTMLCOMMENTELEMENT2_APPENDDATA     DISPID_COMMENTPDL+6
+#define DISPID_IHTMLCOMMENTELEMENT2_INSERTDATA     DISPID_COMMENTPDL+7
+#define DISPID_IHTMLCOMMENTELEMENT2_DELETEDATA     DISPID_COMMENTPDL+8
+#define DISPID_IHTMLCOMMENTELEMENT2_REPLACEDATA    DISPID_COMMENTPDL+9
+
 /* IHTMLTable */
 #define DISPID_IHTMLTABLE_COLS                DISPID_TABLE+1
 #define DISPID_IHTMLTABLE_BORDER              DISPID_TABLE+2
diff --git a/include/mshtml.idl b/include/mshtml.idl
index 4091e8de05f..055150bd1bd 100644
--- a/include/mshtml.idl
+++ b/include/mshtml.idl
@@ -9632,6 +9632,76 @@ coclass HTMLDocument
                       interface IHTMLDOMNode2;
 }
 
+/*****************************************************************************
+ *    IHTMLCommentElement interface
+ */
+[
+    odl,
+    oleautomation,
+    dual,
+    uuid(3050f20c-98b5-11cf-bb82-00aa00bdce0b)
+]
+interface IHTMLCommentElement : IDispatch
+{
+    [propput, id(DISPID_IHTMLCOMMENTELEMENT_TEXT), displaybind, bindable]
+    HRESULT text([in] BSTR v);
+
+    [propget, id(DISPID_IHTMLCOMMENTELEMENT_TEXT), displaybind, bindable]
+    HRESULT text([out, retval] BSTR *p);
+
+    [propput, id(DISPID_IHTMLCOMMENTELEMENT_ATOMIC), displaybind, bindable]
+    HRESULT atomic([in] long v);
+
+    [propget, id(DISPID_IHTMLCOMMENTELEMENT_ATOMIC), displaybind, bindable]
+    HRESULT atomic([out, retval] long *p);
+}
+
+/*****************************************************************************
+ *    IHTMLCommentElement2 interface
+ */
+[
+    odl,
+    oleautomation,
+    dual,
+    uuid(3050f813-98b5-11cf-bb82-00aa00bdce0b)
+]
+interface IHTMLCommentElement2 : IDispatch
+{
+    [propput, id(DISPID_IHTMLCOMMENTELEMENT2_DATA)]
+    HRESULT data([in] BSTR v);
+
+    [propget, id(DISPID_IHTMLCOMMENTELEMENT2_DATA)]
+    HRESULT data([out, retval] BSTR *p);
+
+    [propget, id(DISPID_IHTMLCOMMENTELEMENT2_LENGTH)]
+    HRESULT length([out, retval] long *p);
+
+    [id(DISPID_IHTMLCOMMENTELEMENT2_SUBSTRINGDATA)]
+    HRESULT substringData(
+            [in] long offset,
+            [in] long Count,
+            [out, retval] BSTR *pbstrsubString);
+
+    [id(DISPID_IHTMLCOMMENTELEMENT2_APPENDDATA)]
+    HRESULT appendData([in] BSTR bstrstring);
+
+    [id(DISPID_IHTMLCOMMENTELEMENT2_INSERTDATA)]
+    HRESULT insertData(
+            [in] long offset,
+            [in] BSTR bstrstring);
+
+    [id(DISPID_IHTMLCOMMENTELEMENT2_DELETEDATA)]
+    HRESULT deleteData(
+            [in] long offset,
+            [in] long Count);
+
+    [id(DISPID_IHTMLCOMMENTELEMENT2_REPLACEDATA)]
+    HRESULT replaceData(
+            [in] long offset,
+            [in] long Count,
+            [in] BSTR bstrstring);
+}
+
 /*****************************************************************************
  *    HTMLTableEvents dispinterface
  */