diff --git a/Libraries/LinkingIOS/RCTLinkingManager.h b/Libraries/LinkingIOS/RCTLinkingManager.h
index efe2c63b6..de38c85de 100644
--- a/Libraries/LinkingIOS/RCTLinkingManager.h
+++ b/Libraries/LinkingIOS/RCTLinkingManager.h
@@ -11,17 +11,17 @@
 
 @interface RCTLinkingManager : RCTEventEmitter
 
-+ (BOOL)application:(UIApplication *)app
-            openURL:(NSURL *)URL
-            options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options;
++ (BOOL)application:(nonnull UIApplication *)app
+            openURL:(nonnull NSURL *)URL
+            options:(nonnull NSDictionary<UIApplicationOpenURLOptionsKey, id> *)options;
 
-+ (BOOL)application:(UIApplication *)application
-            openURL:(NSURL *)URL
-  sourceApplication:(NSString *)sourceApplication
-         annotation:(id)annotation;
++ (BOOL)application:(nonnull UIApplication *)application
+              openURL:(nonnull NSURL *)URL
+    sourceApplication:(nullable NSString *)sourceApplication
+           annotation:(nonnull id)annotation;
 
-+ (BOOL)application:(UIApplication *)application
-continueUserActivity:(NSUserActivity *)userActivity
-  restorationHandler:(void (^)(NSArray * __nullable))restorationHandler;
++ (BOOL)application:(nonnull UIApplication *)application
+    continueUserActivity:(nonnull NSUserActivity *)userActivity
+      restorationHandler:(nonnull void (^)(NSArray *__nullable))restorationHandler;
 
 @end