diff --git a/include/constants/flags.h b/include/constants/flags.h
index b61bf0b11..13adf11e6 100644
--- a/include/constants/flags.h
+++ b/include/constants/flags.h
@@ -778,9 +778,7 @@
 #define FLAG_HIDE_AQUA_HIDEOUT_1F_GRUNT_2_BLOCKING_ENTRANCE         0x336
 #define FLAG_HIDE_MOSSDEEP_CITY_TEAM_MAGMA                          0x337
 #define FLAG_HIDE_PETALBURG_GYM_WALLYS_UNCLE                        0x338
-
-#define FLAG_UNUSED_0x339                                           0x339 // Unused Flag
-
+#define FLAG_HIDE_LEGEND_MON_CAVE_OF_ORIGIN                         0x339 // Unused, leftover from R/S
 #define FLAG_HIDE_SOOTOPOLIS_CITY_ARCHIE                            0x33A
 #define FLAG_HIDE_SOOTOPOLIS_CITY_MAXIE                             0x33B
 #define FLAG_HIDE_SEAFLOOR_CAVERN_ROOM_9_ARCHIE                     0x33C