diff --git a/build/systemMenu_RED/Launcher/ARM9/src/loadWlanFirm.c b/build/systemMenu_RED/Launcher/ARM9/src/loadWlanFirm.c
index bd810a65..7dd1516f 100644
--- a/build/systemMenu_RED/Launcher/ARM9/src/loadWlanFirm.c
+++ b/build/systemMenu_RED/Launcher/ARM9/src/loadWlanFirm.c
@@ -30,6 +30,7 @@
 /* 無線FW認証処理にかかる時間を計測する。 */
 #define MEASURE_VERIFY_SIGN_TIME     1
 
+/* Index of public key for WLAN firm */
 #define WLANFIRM_PUBKEY_INDEX        1
 #define USE_ACSIGN                   0 /* for experimental purpose */
 #define SIGN_LENGTH                  128