diff --git a/dlls/riched20/editor.c b/dlls/riched20/editor.c
index f78e515..8caa1f8 100644
--- a/dlls/riched20/editor.c
+++ b/dlls/riched20/editor.c
@@ -101,6 +101,7 @@
   - EM_SETIMEOPTIONS 1.0asian
   - EM_SETLANGOPTIONS 2.0
   - EM_SETLIMITTEXT
+  - EM_SETMARGINS
   + EM_SETMODIFY (not sure if implementation is correct)
   - EM_SETOLECALLBACK
   + EM_SETOPTIONS (partially implemented)
@@ -2549,6 +2550,7 @@ static LRESULT RichEditWndProc_common(HWND hWnd, UINT msg, WPARAM wParam,
   UNSUPPORTED_MSG(EM_SETEDITSTYLE)
   UNSUPPORTED_MSG(EM_SETFONTSIZE)
   UNSUPPORTED_MSG(EM_SETLANGOPTIONS)
+  UNSUPPORTED_MSG(EM_SETMARGINS)
   UNSUPPORTED_MSG(EM_SETPALETTE)
   UNSUPPORTED_MSG(EM_SETTABSTOPS)
   UNSUPPORTED_MSG(EM_SETTYPOGRAPHYOPTIONS)