diff --git a/_includes/messages/3.17/showMessage.md b/_includes/messages/3.17/showMessage.md
index cd73c0c..f734292 100644
--- a/_includes/messages/3.17/showMessage.md
+++ b/_includes/messages/3.17/showMessage.md
@@ -42,7 +42,14 @@ export namespace MessageType {
 	 * A log message.
 	 */
 	export const Log = 4;
+	/**
+	 * A debug message.
+	 *
+	 * @since 3.18.0
+	 * @proposed
+	 */
+	export const Debug = 5;
 }
 
-export type MessageType = 1 | 2 | 3 | 4;
+export type MessageType = 1 | 2 | 3 | 4 | 5;
 ```
diff --git a/_includes/messages/3.18/showMessage.md b/_includes/messages/3.18/showMessage.md
index cd73c0c..eb20acb 100644
--- a/_includes/messages/3.18/showMessage.md
+++ b/_includes/messages/3.18/showMessage.md
@@ -42,7 +42,13 @@ export namespace MessageType {
 	 * A log message.
 	 */
 	export const Log = 4;
+	/**
+	 * A debug message.
+	 *
+	 * @since 3.18.0
+	 */
+	export const Debug = 5;
 }
 
-export type MessageType = 1 | 2 | 3 | 4;
+export type MessageType = 1 | 2 | 3 | 4 | 5;
 ```