diff --git a/configure/CONFIG_SITE b/configure/CONFIG_SITE
index 5ac2a1ab7..5b957fbca 100644
--- a/configure/CONFIG_SITE
+++ b/configure/CONFIG_SITE
@@ -39,6 +39,7 @@
 #	solaris-x86            (sun compiler used for host builds)
 #	solaris-x86-gnu        (GNU compiler used for host builds)
 #	win32-x86              (MS Visual C++ compiler used for host builds)
+#	win32-x86-debug        (MS Visual C++ compiler debugging options)
 #	win32-x86_MinGW        (MinGW compiler used for host builds)
 #	win32-x86-borland      (Borland C++ compiler used for host builds)
 #	win32-x86-cygwin       (cygwin GNU compiler used for host builds)