diff --git a/src/knx/config.h b/src/knx/config.h
index 2ef1b85..0b3ce64 100644
--- a/src/knx/config.h
+++ b/src/knx/config.h
@@ -57,7 +57,8 @@
 #endif
 
 // KNX Data Secure Options
-#define USE_DATASECURE
+// Define via a compiler -D flag if required
+// #define USE_DATASECURE
 
 #endif