diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 00000000..18e385b0
Binary files /dev/null and b/.DS_Store differ
diff --git a/Project 24 - HitList/.DS_Store b/Project 24 - HitList/.DS_Store
new file mode 100644
index 00000000..a2a1a8e0
Binary files /dev/null and b/Project 24 - HitList/.DS_Store differ
diff --git a/Project 24 - HitList/HitList.xcodeproj/project.pbxproj b/Project 24 - HitList/HitList.xcodeproj/project.pbxproj
index 327570c3..1faa8e9a 100644
--- a/Project 24 - HitList/HitList.xcodeproj/project.pbxproj	
+++ b/Project 24 - HitList/HitList.xcodeproj/project.pbxproj	
@@ -196,6 +196,7 @@
 				TargetAttributes = {
 					193BC8681C8F4E66003E6D2D = {
 						CreatedOnToolsVersion = 7.2.1;
+						DevelopmentTeam = 466F2TNFRB;
 						LastSwiftMigration = 1020;
 					};
 					193BC87F1C8F4E66003E6D2D = {
@@ -429,9 +430,10 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				DEVELOPMENT_TEAM = 466F2TNFRB;
 				INFOPLIST_FILE = HitList/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = com.yigu.HitList;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yigu.HitList2oi1o2i;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 			};
@@ -441,9 +443,10 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				DEVELOPMENT_TEAM = 466F2TNFRB;
 				INFOPLIST_FILE = HitList/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				PRODUCT_BUNDLE_IDENTIFIER = com.yigu.HitList;
+				PRODUCT_BUNDLE_IDENTIFIER = com.yigu.HitList2oi1o2i;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
 			};
diff --git a/Project 24 - HitList/HitList/ViewController.swift b/Project 24 - HitList/HitList/ViewController.swift
index c846f6ad..6285077d 100644
--- a/Project 24 - HitList/HitList/ViewController.swift	
+++ b/Project 24 - HitList/HitList/ViewController.swift	
@@ -53,8 +53,19 @@ class ViewController: UIViewController, UITableViewDataSource {
     let person = people[indexPath.row]
     cell.textLabel!.text = person.value(forKey: "name") as? String
     
+    cell.accessoryType = cell.isSelected ? .checkmark : .none
     return cell
   }
+
+func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+    let cell = tableView.cellForRow(at: indexPath)
+    if cell?.accessoryType == .checkmark {
+        cell?.accessoryType = .none
+    } else {
+        cell?.accessoryType = .checkmark
+    }
+    tableView.deselectRow(at: indexPath, animated: true)
+}
   
   func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
     switch editingStyle {