diff --git a/.github/copilot-instructions.md b/.github/instructions/main.instructions.md
similarity index 87%
rename from .github/copilot-instructions.md
rename to .github/instructions/main.instructions.md
index 81fb5e0..9150544 100644
--- a/.github/copilot-instructions.md
+++ b/.github/instructions/main.instructions.md
@@ -1,3 +1,8 @@
+---
+description: "全てのファイルに適用される全ての挙動の大前提としてのルール"
+applyTo: "**"
+---
+
 ## Core Requirements
 
 - Use Japanese.