diff --git a/Example/ExampleTests/NoPrefixTests.m b/Example/ExampleTests/NoPrefixTests.m
index 818ff03..b6f0247 100644
--- a/Example/ExampleTests/NoPrefixTests.m
+++ b/Example/ExampleTests/NoPrefixTests.m
@@ -10,8 +10,8 @@
 #import "GVUserDefaults.h"
 
 @interface GVUserDefaults (NoPrefix)
-@property NSString *userName;
-@property NSNumber *userId;
+@property (nonatomic, weak) NSString *userName;
+@property (nonatomic, weak) NSNumber *userId;
 @end
 
 @implementation GVUserDefaults (NoPrefix)
diff --git a/Example/GVUserDefaults+Properties.h b/Example/GVUserDefaults+Properties.h
index edbce51..f394f79 100644
--- a/Example/GVUserDefaults+Properties.h
+++ b/Example/GVUserDefaults+Properties.h
@@ -10,7 +10,7 @@
 
 @interface GVUserDefaults (Properties)
 
-@property NSString *userName;
-@property NSNumber *userId;
+@property (nonatomic, weak) NSString *userName;
+@property (nonatomic, weak) NSNumber *userId;
 
 @end
diff --git a/README.md b/README.md
index 735fabc..e71fac1 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,8 @@ Create a category on `GVUserDefaults`, add some properties in the .h file and ma
 
     // .h
     @interface GVUserDefaults (Properties)
-    @property NSString *userName;
-    @property NSNumber *userId;
+    @property (nonatomic, weak) NSString *userName;
+    @property (nonatomic, weak) NSNumber *userId;
     @end
 
     // .m