diff --git a/src/common/redux/states/annotation.ts b/src/common/redux/states/annotation.ts
index 9b0be9368..96a04d66d 100644
--- a/src/common/redux/states/annotation.ts
+++ b/src/common/redux/states/annotation.ts
@@ -14,7 +14,7 @@ export interface IAnnotationState {
     uuid: string;
     name: string; // like bookmark name
     comment: string; // describe annotation mark
-    hash: string; // md5 ( `${href}:${JSON.stringify(def)}` ))
+    hash: string; // sha256 ( `${href}:${JSON.stringify(def)}` ))
     href: string; // from IHighlightHandlerState
     def: IHighlightDefinition; // from IHighlightHandlerState
 }
diff --git a/src/renderer/reader/redux/sagas/annotation.ts b/src/renderer/reader/redux/sagas/annotation.ts
index f9a6d4e4a..8c5595a37 100644
--- a/src/renderer/reader/redux/sagas/annotation.ts
+++ b/src/renderer/reader/redux/sagas/annotation.ts
@@ -74,8 +74,6 @@ function* selectionInfoWatcher(action: readerLocalActionSetLocator.TAction): Sag
         }
         yield* putTyped(readerLocalActionAnnotations.push.build(annotation));
     }
-
-    crypto.subtle.digest("SHA-256", Buffer.from(""));
 }
 
 function* annotationUIEnable(_action: readerLocalActionAnnotationUI.enable.TAction): SagaIterator {