diff --git a/wifi.ino b/wifi.ino
index 9ff2a70..9e6dfa9 100644
--- a/wifi.ino
+++ b/wifi.ino
@@ -1,7 +1,7 @@
 #include <M5StickCPlus.h>
 #include <WiFi.h>
 
-const char *ssid = "miura2g";
+const char *ssid = "miura2g"; // 802.11b/g (2.4GHz)only. 5GHz is not supported.
 const char *password = "jikken2022";
 const char *ntpserver = "ntp.nict.jp";
 
@@ -48,7 +48,7 @@
 struct tm localTime;
 void ntp_setup()
 {
-    configTime(9 * 3600, 0, ntpserver);
+    configTime(9 * 3600, 0, ntpserver); // NTPサーバからLocalTimeへの時刻同期
 
     delay(1000);
 
@@ -62,9 +62,10 @@
     }
     M5.Beep.tone(2000);
 
-    setRTCfromLT(localTime);
+    setRTCfromLT(localTime); //LocalTimeからRTCへの時刻同期
 }
 
+// LocalTimeからRTCへの時刻同期
 void setRTCfromLT(struct tm lt) {
   RTC_DateTypeDef DateStruct;
   DateStruct.Year = lt.tm_year + 1900;