diff --git a/lib/isc/win32/include/isc/net.h b/lib/isc/win32/include/isc/net.h
index 7d42ddd5de..6d01903bfe 100644
--- a/lib/isc/win32/include/isc/net.h
+++ b/lib/isc/win32/include/isc/net.h
@@ -64,6 +64,8 @@
  *** Defines.
  ***/
 
+/* XXXRTH  ISC_NET_ should be converted to ISC_PLATFORM_ */
+
 /*
  * If sockaddrs on this system have an sa_len field, ISC_PLATFORM_HAVESALEN
  * will be defined.