diff --git a/vcl/README.vars b/vcl/README.vars
index 2749d869feef..b76b0517b07a 100644
--- a/vcl/README.vars
+++ b/vcl/README.vars
@@ -8,6 +8,7 @@ SAL_FORCEDPI - force a specific DPI (gtk & gtk3 plugins only)
 
 VCL_DOUBLEBUFFERING_AVOID_PAINT - don't paint the buffer, useful to see where we do direct painting
 VCL_DOUBLEBUFFERING_FORCE_ENABLE - enable double buffered painting
+VCL_DOUBLEBUFFERING_ENABLE - enable a safe subset of double buffered painting (currently in Writer, not in any other applications)
 
 VCL_HIDE_WINDOWS - don't draw windows