diff --git a/include/Makefile.in b/include/Makefile.in
index f28cfab..881b92d 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -15,6 +15,7 @@ IDL_H_SRCS = \
 	bits1_5.idl \
 	comcat.idl \
 	control.idl \
+        ctxtcall.idl \
 	d3d10.idl \
 	ddstream.idl \
 	dimm.idl \
diff --git a/include/ctxtcall.idl b/include/ctxtcall.idl
new file mode 100644
index 0000000..e67f23d
--- /dev/null
+++ b/include/ctxtcall.idl
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2008 Louis Lenders
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+import "objidl.idl";
+
+typedef struct tagComCallData
+{
+    DWORD dispid;
+    DWORD dwreserved;
+    void  *userdata;
+} ComCallData;
+
+typedef HRESULT (__stdcall *PFNCONTEXTCALL)(ComCallData *pparam);
+
+/*****************************************************************************
+ * IContextCallback interface
+ */
+[
+    local,
+    object,
+    uuid(000001da-0000-0000-c000-000000000046),
+    pointer_default(unique)
+]
+
+interface IContextCallback : IUnknown
+{
+    HRESULT ContextCallback(
+        [in]  PFNCONTEXTCALL callback,
+        [in]  ComCallData  *pparam,
+        [in]  REFIID riid,
+        [in]  int method,
+        [in]  IUnknown  *punk);
+}