diff --git a/NSManagedObject+safeSetValuesForKeysWithDictionary.h b/NSManagedObject+safeSetValuesForKeysWithDictionary.h
index eae9dae..130fdf0 100644
--- a/NSManagedObject+safeSetValuesForKeysWithDictionary.h
+++ b/NSManagedObject+safeSetValuesForKeysWithDictionary.h
@@ -12,4 +12,6 @@
 
 - (void)safeSetManagedValuesForKeysWithDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter;
 
+- (void)safeSetManagedValuesForKeysWithDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter mapping:(NSDictionary *)mapping;
+
 @end
diff --git a/NSManagedObject+safeSetValuesForKeysWithDictionary.m b/NSManagedObject+safeSetValuesForKeysWithDictionary.m
index 043a271..45201d6 100644
--- a/NSManagedObject+safeSetValuesForKeysWithDictionary.m
+++ b/NSManagedObject+safeSetValuesForKeysWithDictionary.m
@@ -10,11 +10,18 @@
 
 @implementation NSManagedObject (safeSetValuesForKeysWithDictionary)
 
-- (void)safeSetManagedValuesForKeysWithDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter
+- (void)safeSetManagedValuesForKeysWithDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter {
+    [self safeSetManagedValuesForKeysWithDictionary:keyedValues dateFormatter:dateFormatter mapping:nil];
+}
+
+- (void)safeSetManagedValuesForKeysWithDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter mapping:(NSDictionary *)mapping
 {
     NSDictionary *attributes = [[self entity] attributesByName];
     for (NSString *attribute in attributes) {
-        id value = [keyedValues objectForKey:attribute];
+        id value = nil;
+        if (mapping != nil) { value = [keyedValues objectForKey:[mapping objectForKey:attribute]]; }
+        else { value = [keyedValues objectForKey:attribute]; }
+        
         if (value == nil) {
             continue;
         }
diff --git a/README.md b/README.md
index 0a2d75d..3d18d88 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,21 @@ Some categories to map JSON to CoreData model
 Credit goes to original author, Tom Harrington :
 http://www.cimgf.com/2011/06/02/saving-json-to-core-data/
 
+# EXAMPLE
+NSDictionary *mapping = @{
+						  @"name": @"countdownName",
+						  @"date": @"countdownDate"
+						  };
+						  
+NSDictionary *values = @{
+						 @"countdownName": @"Hello",
+						 @"countdownDate": @"10/29/2008 08:29PM"
+						 };
+						 
+Countdown *newObject = [NSEntityDescription insertNewObjectForEntityForName:@"Countdown" inManagedObjectContext:self.managedObjectContext];
+
+[newObject safeSetManagedValuesForKeysWithDictionary:values dateFormatter:dateFormat mapping:mapping];
+
 ## TODO
 
 This  category does not deal with relationships