diff --git a/battle/effects/endure.asm b/battle/effects/endure.asm
index b6ae9358e..79f657a24 100644
--- a/battle/effects/endure.asm
+++ b/battle/effects/endure.asm
@@ -1,6 +1,8 @@
 BattleCommand5a: ; 3766f
 ; endure
 
+; Endure shares code with Protect. See protect.asm.
+
 	call ProtectChance
 	ret c