add comment into each config.h

keyboards/helix/rev2/keymaps/default/config.h

@@ -21,6 +21,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 // place overrides here
 
 #endif /* CONFIG_USER_H */

keyboards/helix/rev2/keymaps/edvorakjp/config.h

@@ -1,6 +1,9 @@
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 #undef TAPPING_FORCE_HOLD
 #undef TAPPING_TERM
 #define TAPPING_TERM 120

keyboards/helix/rev2/keymaps/five_rows/config.h

@@ -21,6 +21,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 // place overrides here
 
 #endif /* CONFIG_USER_H */

keyboards/helix/rev2/keymaps/five_rows_jis/config.h

@@ -23,6 +23,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 // place overrides here
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 #ifdef MOUSEKEY_ENABLE
   #undef MOUSEKEY_INTERVAL
   #define MOUSEKEY_INTERVAL 0

keyboards/helix/rev2/keymaps/froggy/config.h

@@ -21,6 +21,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 #undef TAPPING_TERM
 #define TAPPING_TERM 200
 #define ONESHOT_TAP_TOGGLE 5 /* Tapping this number of times holds the key until tapped this number of times again. */

keyboards/helix/rev2/keymaps/led_test/config.h

@@ -21,6 +21,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef CONFIG_USER_H
 #define CONFIG_USER_H
 
+// if you need more program area, try uncomment follow line
+//#undef SERIAL_USE_MULTI_TRANSACTION
+
 // place overrides here
 
 #endif /* CONFIG_USER_H */

keyboards/helix/rev2/serial_config.h

@@ -8,7 +8,6 @@
 #define SERIAL_PIN_MASK _BV(PD2)
 #define SERIAL_PIN_INTERRUPT INT2_vect
 
-// if you need more program area, comment out this macro
 #define SERIAL_USE_MULTI_TRANSACTION
 
 //// #error rev2 serial config