diff --git a/dlls/ddraw/dclipper/main.c b/dlls/ddraw/dclipper/main.c
index bab3ea68919..9e36d2d0516 100644
--- a/dlls/ddraw/dclipper/main.c
+++ b/dlls/ddraw/dclipper/main.c
@@ -124,22 +124,53 @@ ULONG WINAPI Main_DirectDrawClipper_Release(LPDIRECTDRAWCLIPPER iface) {
     else return This->ref;
 }
 
+/***********************************************************************
+*           IDirectDrawClipper::GetClipList
+*
+* Retrieve a copy of the clip list
+*
+* PARAMS
+*  lpRect  Rectangle to be used to clip the clip list or NULL for the
+*          entire clip list
+*  lpClipList structure for the resulting copy of the clip list.
+           If NULL, fills lpdwSize up to the number of bytes necessary to hold
+           the entire clip.
+*  lpdwSize Size of resulting clip list; size of the buffer at lpClipList
+           or, if lpClipList is NULL, receives the required size of the buffer
+           in bytes
+* RETURNS
+*  Either DD_OK or DDERR_*
+*/
 HRESULT WINAPI Main_DirectDrawClipper_GetClipList(
-    LPDIRECTDRAWCLIPPER iface,LPRECT prcClip,LPRGNDATA lprgn,LPDWORD pdwSize
+    LPDIRECTDRAWCLIPPER iface, LPRECT lpRect, LPRGNDATA lpClipList,
+    LPDWORD lpdwSize
 ) {
     ICOM_THIS(IDirectDrawClipperImpl,iface);
     static int warned = 0;
     if (warned++ < 10)
-	FIXME("(%p,%p,%p,%p),stub!\n",This,prcClip,lprgn,pdwSize);
-    if (pdwSize) *pdwSize=0;
+	FIXME("(%p,%p,%p,%p),stub!\n",This,lpRect,lpClipList,lpdwSize);
+    if (lpdwSize) *lpdwSize=0;
     return DDERR_NOCLIPLIST;
 }
 
+/***********************************************************************
+*           IDirectDrawClipper::SetClipList
+*
+* Sets or deletes (if lprgn is NULL) the clip list
+*
+* PARAMS
+*  lprgn   Pointer to a LRGNDATA structure or NULL
+*  dwFlags not used, must be 0
+* RETURNS
+*  Either DD_OK or DDERR_*
+*/
 HRESULT WINAPI Main_DirectDrawClipper_SetClipList(
-    LPDIRECTDRAWCLIPPER iface,LPRGNDATA lprgn,DWORD pdwSize
+    LPDIRECTDRAWCLIPPER iface,LPRGNDATA lprgn,DWORD dwFlag
 ) {
     ICOM_THIS(IDirectDrawClipperImpl,iface);
-    FIXME("(%p,%p,%ld),stub!\n",This,lprgn,pdwSize);
+    static int warned = 0;
+    if (warned++ < 10 || lprgn == NULL)
+        FIXME("(%p,%p,%ld),stub!\n",This,lprgn,dwFlag);
     return DD_OK;
 }
 
diff --git a/dlls/ddraw/dclipper/main.h b/dlls/ddraw/dclipper/main.h
index 1873781fc97..16af5b6d6bb 100644
--- a/dlls/ddraw/dclipper/main.h
+++ b/dlls/ddraw/dclipper/main.h
@@ -30,11 +30,11 @@ Main_DirectDrawClipper_SetHwnd(LPDIRECTDRAWCLIPPER iface, DWORD dwFlags,
 			       HWND hWnd);
 ULONG WINAPI Main_DirectDrawClipper_Release(LPDIRECTDRAWCLIPPER iface);
 HRESULT WINAPI
-Main_DirectDrawClipper_GetClipList(LPDIRECTDRAWCLIPPER iface,LPRECT prcClip,
-				   LPRGNDATA lprgn,LPDWORD pdwSize);
+Main_DirectDrawClipper_GetClipList(LPDIRECTDRAWCLIPPER iface, LPRECT lpRect,
+				   LPRGNDATA lpClipList, LPDWORD lpdwSize);
 HRESULT WINAPI
 Main_DirectDrawClipper_SetClipList(LPDIRECTDRAWCLIPPER iface,LPRGNDATA lprgn,
-				   DWORD pdwSize);
+				   DWORD dwFlag);
 HRESULT WINAPI
 Main_DirectDrawClipper_QueryInterface(LPDIRECTDRAWCLIPPER iface, REFIID riid,
 				      LPVOID* ppvObj);