3 files changed, 6 insertions, 0 deletions
diff --git a/ref/store/chain/close.go b/ref/store/chain/close.go
index 403e178e..75fa357e 100644
--- a/ref/store/chain/close.go
+++ b/ref/store/chain/close.go
@@ -1,4 +1,6 @@
 package chain
 
 // Close releases wrapper-local resources.
+//
+// Labels: MT-Unsafe.
 func (chain *Chain) Close() error { return nil }
diff --git a/ref/store/files/close.go b/ref/store/files/close.go
index 0e5212d0..84a69dab 100644
--- a/ref/store/files/close.go
+++ b/ref/store/files/close.go
@@ -1,6 +1,8 @@
 package files
 
 // Close releases resources associated with the store.
+//
+// Labels: MT-Unsafe.
 func (store *Store) Close() error {
 	return store.commonRoot.Close()
 }
diff --git a/ref/store/reading.go b/ref/store/reading.go
index 66528127..99f8278c 100644
--- a/ref/store/reading.go
+++ b/ref/store/reading.go
@@ -34,5 +34,7 @@ type ReadingStore interface {
 	// Close releases resources associated with the store.
 	//
 	// Transactions and batches borrowing the store are invalid after Close.
+	//
+	// Labels: MT-Unsafe.
 	Close() error
 }