diff --git a/AIStudyApp/AIStudyApp.xcodeproj/project.xcworkspace/xcuserdata/Admin1.xcuserdatad/UserInterfaceState.xcuserstate b/AIStudyApp/AIStudyApp.xcodeproj/project.xcworkspace/xcuserdata/Admin1.xcuserdatad/UserInterfaceState.xcuserstate
index dbf0672..d9f3afe 100644
Binary files a/AIStudyApp/AIStudyApp.xcodeproj/project.xcworkspace/xcuserdata/Admin1.xcuserdatad/UserInterfaceState.xcuserstate and b/AIStudyApp/AIStudyApp.xcodeproj/project.xcworkspace/xcuserdata/Admin1.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/AIStudyApp/AIStudyApp/Features/MaterialReader/MaterialReaderView.swift b/AIStudyApp/AIStudyApp/Features/MaterialReader/MaterialReaderView.swift
index 8dfe539..58f0910 100644
--- a/AIStudyApp/AIStudyApp/Features/MaterialReader/MaterialReaderView.swift
+++ b/AIStudyApp/AIStudyApp/Features/MaterialReader/MaterialReaderView.swift
@@ -101,6 +101,7 @@ struct MaterialReaderView: View {
     @State private var hasRestoredPosition = false
     @State private var restoreBlockId: String?
     @State private var actualContentHeight: CGFloat = 1
+    @State private var isMarkedRead = false
 
     private let title: String
     private let knowledgeBaseId: String?
@@ -157,16 +158,26 @@ struct MaterialReaderView: View {
         .toolbarBackground(.hidden, for: .navigationBar)
         .toolbar {
             ToolbarItem(placement: .topBarTrailing) {
-                NavigationLink(value: Route.aiChat(context: ChatEntryContext(
-                    scopeType: .material,
-                    scopeId: vm.materialId,
-                    scopeName: title,
-                    parentKnowledgeBaseId: knowledgeBaseId,
-                    createdFrom: "material_reader"
-                ))) {
-                    Image(systemName: "bubble.left.and.bubble.right")
-                        .font(.system(size: 16))
-                        .foregroundColor(Color.zxF05)
+                HStack(spacing: 16) {
+                    Button {
+                        markAsRead()
+                    } label: {
+                        Image(systemName: isMarkedRead ? "checkmark.circle.fill" : "checkmark.circle")
+                            .font(.system(size: 16))
+                            .foregroundColor(isMarkedRead ? Color.green : Color.zxF05)
+                    }
+
+                    NavigationLink(value: Route.aiChat(context: ChatEntryContext(
+                        scopeType: .material,
+                        scopeId: vm.materialId,
+                        scopeName: title,
+                        parentKnowledgeBaseId: knowledgeBaseId,
+                        createdFrom: "material_reader"
+                    ))) {
+                        Image(systemName: "bubble.left.and.bubble.right")
+                            .font(.system(size: 16))
+                            .foregroundColor(Color.zxF05)
+                    }
                 }
             }
         }
@@ -293,6 +304,15 @@ struct MaterialReaderView: View {
         print("[READER] V1 session closed")
     }
 
+    /// Mark the current material as read — optimistic update + event push.
+    private func markAsRead() {
+        guard !isMarkedRead else { return }
+        isMarkedRead = true
+        sessionManager.markAsRead()
+        // V1 fallback
+        collector.markAsRead(materialId: vm.materialId)
+    }
+
     /// Build a NoteAnchor from the current scroll position (for quick note).
     private func buildAnchor() -> NoteAnchor? {
         let pos = sessionManager.lastPosition ?? collector.lastPosition