diff --git a/README.md b/README.md
index 0b53bc3..1741fd6 100644
--- a/README.md
+++ b/README.md
@@ -10,11 +10,11 @@ iOS 9.0+, Swift 5.5
 
 ## Installation
 
-##### Swift Package Manager (Recommended)
+#### Swift Package Manager (Recommended)
 
 - File > Swift Packages > Add Package Dependency
 - Add `https://github.com/Jinya/AppStoreReviewManager.git`
-- Select "Exact Version"
+- Select "Exact Version" (recommend using the latest exact version)
 
 
 ## How to Use
@@ -23,7 +23,7 @@ iOS 9.0+, Swift 5.5
 import AppStoreReviewManager
 
 // Get App Store page url String for your app
-AppStoreReviewManager.appStorePageURLString(with: YOUR_APP_APP_STORE_ID)
+let urlString = AppStoreReviewManager.appStorePageURLString(with: YOUR_APP_APP_STORE_ID)
 
 // Open App Store page for your app
 AppStoreReviewManager.openAppStorePage(with: YOUR_APP_APP_STORE_ID)
diff --git a/Sources/AppStoreReviewManager/AppStoreReviewManager.swift b/Sources/AppStoreReviewManager/AppStoreReviewManager.swift
index 3f23c3f..56e5361 100644
--- a/Sources/AppStoreReviewManager/AppStoreReviewManager.swift
+++ b/Sources/AppStoreReviewManager/AppStoreReviewManager.swift
@@ -40,23 +40,32 @@ public struct AppStoreReviewManager {
     
     /// Request StoreKit to ask the user to rate or review your app, users will submit a rating through the standardized prompt, and can write and submit a review without leaving the app. You can prompt for ratings up to three times in a 365-day period.
     public static func requestReviewInApp() {
-        if #available(iOS 14.0, *) {
-            let keyWindow = UIApplication.shared.connectedScenes.compactMap({ $0 as? UIWindowScene }).flatMap { $0.windows }.first { $0.isKeyWindow }
-            guard let windowScene = keyWindow?.windowScene else {
-                assertionFailure("AppStoreReviewManager can't find key window of the app!")
-                return
+        let task = {
+            if #available(iOS 14.0, *) {
+                let keyWindow = UIApplication.shared.connectedScenes.compactMap({ $0 as? UIWindowScene }).flatMap { $0.windows }.first { $0.isKeyWindow }
+                guard let windowScene = keyWindow?.windowScene else {
+                    assertionFailure("AppStoreReviewManager can't find key window of the app!")
+                    return
+                }
+                SKStoreReviewController.requestReview(in: windowScene)
+            } else if #available(iOS 10.3, *) {
+                SKStoreReviewController.requestReview()
+            } else {
+                #if DEBUG
+                print("This operation is not supported on systems older than iOS 10.3")
+                #endif
             }
-            SKStoreReviewController.requestReview(in: windowScene)
-        } else if #available(iOS 10.3, *) {
-            SKStoreReviewController.requestReview()
+        }
+        
+        if Thread.isMainThread {
+            task()
         } else {
-            #if DEBUG
-            print("This operation is not supported on systems older than iOS 10.3")
-            #endif
+            DispatchQueue.main.async {
+                task()
+            }
         }
     }
     
-    
     /// To enable a user to initiate a review as a result of an action in the UI use a deep link to the App Store page for your app with the query parameter action=write-review appended to the URL.
     /// - Parameter id: the App Store ID for your app, you can find the App Store ID in your app's product URL
     public static func requestReviewInAppStore(with id: String) {