diff --git a/src/hb-config.hh b/src/hb-config.hh
index 8d71a1102dcbccecfb6a9aa4e952026ab6a96a96..09f71155bfa207af031aee9b221e7117a4ad2f16 100644
--- a/src/hb-config.hh
+++ b/src/hb-config.hh
@@ -38,6 +38,7 @@
 #ifdef HB_TINY
 #define HB_LEAN
 #define HB_MINI
+//#define HB_NO_MT /* Let user choose */
 #endif
 
 #ifdef HB_LEAN