diff --git a/locales/en.yml b/locales/en.yml
index a23be510..8726c0b3 100644
--- a/locales/en.yml
+++ b/locales/en.yml
@@ -1,3 +1,8 @@
+# =================================
+# IMPORTANT:
+# Please read 'readme_first.txt' before making any changes.
+# =================================
+
 common:
     go_back_button_label: Go Back
 
diff --git a/locales/ja.yml b/locales/ja.yml
index 65604ff1..9e9da6ef 100644
--- a/locales/ja.yml
+++ b/locales/ja.yml
@@ -1,3 +1,8 @@
+# =================================
+# IMPORTANT:
+# Please read 'readme_first.txt' before making any changes.
+# =================================
+
 common:
     go_back_button_label: 戻る
 
diff --git a/locales/ko.yml b/locales/ko.yml
index 951f94fb..873746b1 100644
--- a/locales/ko.yml
+++ b/locales/ko.yml
@@ -1,3 +1,8 @@
+# =================================
+# IMPORTANT:
+# Please read 'readme_first.txt' before making any changes.
+# =================================
+
 common:
     go_back_button_label: 돌아가기
 
diff --git a/locales/readme_first.txt b/locales/readme_first.txt
index 9d3bc1e8..7c62a102 100644
--- a/locales/readme_first.txt
+++ b/locales/readme_first.txt
@@ -1,3 +1 @@
-Thank you for considering translating VRCT's UI.
-For your information, we are planning to transition VRCT's UI from Python's tkinter to a web-based platform using HTML, CSS, and JavaScript.
-This means there might be structural changes to the UI. We apologize if any of the sentences you translated are removed due to these changes.
\ No newline at end of file
+Thank you for considering translating VRCT's UI. However, please refrain from making any changes at this time. I am currently organizing the files, including reordering, adding, and removing elements, and some parts may change frequently until the UI becomes stable. (Note: This message was updated in December 2024.)
\ No newline at end of file
diff --git a/locales/zh-Hans.yml b/locales/zh-Hans.yml
index 21598828..29dc2c22 100644
--- a/locales/zh-Hans.yml
+++ b/locales/zh-Hans.yml
@@ -1,3 +1,8 @@
+# =================================
+# IMPORTANT:
+# Please read 'readme_first.txt' before making any changes.
+# =================================
+
 common:
     go_back_button_label: 返回
 
diff --git a/locales/zh-Hant.yml b/locales/zh-Hant.yml
index 6416b053..ddeee4a3 100644
--- a/locales/zh-Hant.yml
+++ b/locales/zh-Hant.yml
@@ -1,3 +1,8 @@
+# =================================
+# IMPORTANT:
+# Please read 'readme_first.txt' before making any changes.
+# =================================
+
 common:
     go_back_button_label: 返回