diff --git a/protocol.md b/protocol.md
index 5b7039fd3..6dabd8422 100644
--- a/protocol.md
+++ b/protocol.md
@@ -1691,6 +1691,13 @@ _Request_:
 
 ```typescript
 export interface ApplyWorkspaceEditParams {
+	/**
+	 * An optional label of the workspace edit. This label is
+	 * presented in the user interface for example on an undo
+	 * stack to undo the workspace edit.
+	 */
+	label?: string;
+
 	/**
 	 * The edits to apply.
 	 */