Document GWW_VDB in gcdescr.html

* doc/gcdescr.html (Generational Collection and Dirty Bits): Document
GWW_VDB.

diff --git a/doc/gcdescr.html b/doc/gcdescr.html
index 1db62797e5a9f9a3d902030f12a076ecbe8ce8fc..aba150c53b8b07c289752fdf872de0ba82f416cf 100644 (file)
--- a/doc/gcdescr.html
+++ b/doc/gcdescr.html
@@ -471,6 +471,9 @@ catching write faults.  This is
 implemented for many Unix-like systems and for win32.  It is not possible
 in a few environments.
 <LI>
+(<TT>GWW_VDB</tt>) By using the Win32 GetWriteWatch function to read dirty
+bits.
+<LI>
 (<TT>PROC_VDB</tt>) By retrieving dirty bit information from /proc.
 (Currently only Sun's
 Solaris supports this.  Though this is considerably cleaner, performance