diff --git a/mednafen/headless/headless.h b/mednafen/headless/headless.h
index 68cefe6a5b..01e203bb1d 100644
--- a/mednafen/headless/headless.h
+++ b/mednafen/headless/headless.h
@@ -17,6 +17,7 @@
 #define WANT_DEARCHIVE
 #define WANT_IPS
 
+//features you may want to consider -D in a headless library's makefile
 #define WANT_PSF
 #define WANT_SOFTGUI
 #define WANT_CDIF_MT