diff --git a/src/Lib/Diagnostics/Format/diagnose.ts b/src/Lib/Diagnostics/Format/diagnose.ts
index 5b1a410..03f1578 100644
--- a/src/Lib/Diagnostics/Format/diagnose.ts
+++ b/src/Lib/Diagnostics/Format/diagnose.ts
@@ -17,6 +17,13 @@ export function format_diagnose_path(pack: Pack, uri: string, diagnoser: Diagnos
 
   const relpath = uri.slice(index + length);
 
+  if (relpath.startsWith('volumes/')) diagnoser.add(
+    0,
+    `Volume files have been removed`,
+    DiagnosticSeverity.error,
+    "behaviorpack.volumes.deprecated"
+  );
+
   if (relpath.length > LengthFromRoot) {
     diagnoser.add(
       0,