diff --git a/include/d/d_com_inf_game.h b/include/d/d_com_inf_game.h
index e1df1580a..7a301d8ed 100644
--- a/include/d/d_com_inf_game.h
+++ b/include/d/d_com_inf_game.h
@@ -39,7 +39,7 @@ class camera_class;
 class J2DOrthoGraph;
 class dDemo_actor_c;
 
-enum ALWAYS_RES_FILE_IDS {
+enum ALWAYS_RES_FILE_ID { // IDs and indexes are synced
     /* BCK */
     ALWAYS_BCK_FA=0xC,
     ALWAYS_BCK_OBM_SYOUGEKISW=0xD,
diff --git a/src/d/actor/d_a_am.cpp b/src/d/actor/d_a_am.cpp
index 42196bb94..90f4947cd 100644
--- a/src/d/actor/d_a_am.cpp
+++ b/src/d/actor/d_a_am.cpp
@@ -82,7 +82,7 @@ enum Action {
     ACTION_ITAI_MOVE   = 0x3,
 };
 
-enum AM_RES_FILE_IDS {
+enum AM_RES_FILE_ID { // IDs and indexes are synced
     /* BAS */
     AM_BAS_BOM_NOMI=0x5,
     AM_BAS_BOM_NOMI2=0x6,