diff --git a/src/c/gcmzdrops.c b/src/c/gcmzdrops.c
index ac5c871..091c889 100644
--- a/src/c/gcmzdrops.c
+++ b/src/c/gcmzdrops.c
@@ -783,7 +783,8 @@ static BOOL wndproc_init(HWND const window) {
     char const *apimsg = NULL;
     if (eis_hr(err, HRESULT_FROM_WIN32(ERROR_ALREADY_EXISTS))) {
       apimsg = gettext("This error mainly occurs when multiple instances of AviUtl are running.\n"
-                       "Please close all instances of AviUtl and launch only one.");
+                       "If you need external integration API, please close all instances of AviUtl and start only one instance.\n"
+                       "If you do not need external integration API, you can ignore this message.");
       efree(&err);
     }
     gcmz_error_message_box(err,
diff --git a/src/i18n/ja.po.DO_NOT_EDIT b/src/i18n/ja.po.DO_NOT_EDIT
index 8a23c5d..d6646a3 100644
--- a/src/i18n/ja.po.DO_NOT_EDIT
+++ b/src/i18n/ja.po.DO_NOT_EDIT
@@ -294,10 +294,12 @@ msgstr ""
 
 msgid ""
 "This error mainly occurs when multiple instances of AviUtl are running.\n"
-"Please close all instances of AviUtl and launch only one."
+"If you need external integration API, please close all instances of AviUtl and start only one instance.\n"
+"If you do not need external integration API, you can ignore this message."
 msgstr ""
 "このエラーは主に AviUtl を多重起動した場合に発生します。\n"
-"一度すべての AviUtl を閉じて、ひとつだけを起動してください。"
+"もし外部連携 API が必要な場合は、一度すべての AviUtl を閉じて、ひとつだけを起動してください。\n"
+"外部連携 API が必要ない場合は、このメッセージは無視して構いません。"
 
 msgid "This plug-in is not compatible with extext.auf."
 msgstr "字幕アシストプラグイン extext.auf とは互換性がありません。"
diff --git a/src/i18n/zh_CN.po.DO_NOT_EDIT b/src/i18n/zh_CN.po.DO_NOT_EDIT
index 4e3c3aa..49c24b5 100644
--- a/src/i18n/zh_CN.po.DO_NOT_EDIT
+++ b/src/i18n/zh_CN.po.DO_NOT_EDIT
@@ -293,10 +293,12 @@ msgstr ""
 
 msgid ""
 "This error mainly occurs when multiple instances of AviUtl are running.\n"
-"Please close all instances of AviUtl and launch only one."
+"If you need external integration API, please close all instances of AviUtl and start only one instance.\n"
+"If you do not need external integration API, you can ignore this message."
 msgstr ""
-"此错误主要发生在多个AviUtl实例同时运行时。\n"
-"请关闭所有AviUtl实例，只启动一个。"
+"这个错误主要发生在多个AviUtl实例同时运行时。\n"
+"如果你需要外部集成API，请关闭所有AviUtl实例，只启动一个实例。\n"
+"如果你不需要外部集成API，你可以忽略这个消息。"
 
 msgid "This plug-in is not compatible with extext.auf."
 msgstr "此插件不兼容extext.auf。"