diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index 2447a8c455..4ac1dd8740 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -548,10 +548,11 @@ Available video output drivers are:
 
         X11/GLX only.
 
-    ``dwmflush``
-        Calls ``DwmFlush`` after swapping buffers on Windows (default: 0).
+    ``dwmflush=<no|windowed|yes>``
+        Calls ``DwmFlush`` after swapping buffers on Windows (default: no).
         It also sets ``SwapInterval(0)`` to ignore the OpenGL timing. Values
-        are: 0 (disabled), 1 (only in windowed mode), 2 (also in  full screen).
+        are: no (disabled), windowed (only in windowed mode), yes (also in
+        full screen).
         This may help getting more consistent frame intervals, especially with
         high-fps clips - which might also reduce dropped frames. Typically a
         value of 1 should be enough since full screen may bypass the DWM.
diff --git a/video/out/vo_opengl.c b/video/out/vo_opengl.c
index 136ad03c9f..e409eaa18d 100644
--- a/video/out/vo_opengl.c
+++ b/video/out/vo_opengl.c
@@ -507,7 +507,8 @@ static const struct m_option options[] = {
     OPT_FLAG("glfinish", use_glFinish, 0),
     OPT_FLAG("waitvsync", waitvsync, 0),
     OPT_INT("swapinterval", swap_interval, 0, OPTDEF_INT(1)),
-    OPT_INT("dwmflush", dwm_flush, 0, OPTDEF_INT(0)),
+    OPT_CHOICE("dwmflush", dwm_flush, 0,
+               ({"no", 0}, {"windowed", 1}, {"yes", 2})),
     OPT_FLAG("debug", use_gl_debug, 0),
     OPT_STRING_VALIDATE("backend", backend, 0, mpgl_validate_backend_opt),
     OPT_FLAG("sw", allow_sw, 0),