diff --git a/objective-c.html.markdown b/objective-c.html.markdown
index cf6bf780..30bb8843 100644
--- a/objective-c.html.markdown
+++ b/objective-c.html.markdown
@@ -148,7 +148,13 @@ int main (int argc, const char * argv[])
     [mutableDictionary setObject:@"value1" forKey:@"key1"];
     [mutableDictionary setObject:@"value2" forKey:@"key2"];
     [mutableDictionary removeObjectForKey:@"key1"];
-
+    
+    // Change types from Mutable To Immutable
+    //In general [object mutableCopy] will make the object mutable whereas [object copy] will make the object immutable
+    NSMutableDictionary *aMutableDictionary = [aDictionary mutableCopy];
+    NSDictionary *mutableDictionaryChanged = [mutableDictionary copy];
+    
+    
     // Set object
     NSSet *set = [NSSet setWithObjects:@"Hello", @"Hello", @"World", nil];
     NSLog(@"%@", set); // prints => {(Hello, World)} (may be in different order)