diff --git a/README.md b/README.md
index 644c199..56fa4ea 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ followed without any other context — whether you are a developer integrating a
 device or a coding agent writing code against it. If something you need is not
 covered here, ask Byonoy rather than inferring it.
 
+> [!IMPORTANT]
 > **Manual Absorbance 96: use the serial protocol, not this SDK.** The manual
 > variant of Absorbance 96 is driven **only** through a plain-text serial
 > protocol, documented publicly in