diff --git a/README.md b/README.md
index 8978528..c9838f7 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![GoDoc](https://godoc.org/github.com/emirpasic/gods?status.svg)](https://godoc.org/github.com/emirpasic/gods) [![Build Status](https://travis-ci.org/emirpasic/gods.svg)](https://travis-ci.org/emirpasic/gods) [![PyPI](https://img.shields.io/pypi/l/Django.svg?maxAge=2592000)](https://github.com/emirpasic/gods/blob/master/LICENSE)
+[![GoDoc](https://godoc.org/github.com/emirpasic/gods?status.svg)](https://godoc.org/github.com/emirpasic/gods) [![Build Status](https://travis-ci.org/emirpasic/gods.svg)](https://travis-ci.org/emirpasic/gods) [![Go Report Card](https://goreportcard.com/badge/emirpasic/gods)](https://goreportcard.com/report/emirpasic/gods) [![PyPI](https://img.shields.io/pypi/l/Django.svg?maxAge=2592000)](https://github.com/emirpasic/gods/blob/master/LICENSE)
 
 # GoDS (Go Data Structures)
 
diff --git a/maps/hashmap/hashmap.go b/maps/hashmap/hashmap.go
index 3033f6b..ee7141c 100644
--- a/maps/hashmap/hashmap.go
+++ b/maps/hashmap/hashmap.go
@@ -80,7 +80,7 @@ func (m *Map) Size() int {
 func (m *Map) Keys() []interface{} {
 	keys := make([]interface{}, m.Size())
 	count := 0
-	for key, _ := range m.m {
+	for key := range m.m {
 		keys[count] = key
 		count += 1
 	}
diff --git a/sets/hashset/hashset.go b/sets/hashset/hashset.go
index 54d219b..c5f808c 100644
--- a/sets/hashset/hashset.go
+++ b/sets/hashset/hashset.go
@@ -96,7 +96,7 @@ func (set *Set) Clear() {
 func (set *Set) Values() []interface{} {
 	values := make([]interface{}, set.Size())
 	count := 0
-	for item, _ := range set.items {
+	for item := range set.items {
 		values[count] = item
 		count += 1
 	}
@@ -106,7 +106,7 @@ func (set *Set) Values() []interface{} {
 func (set *Set) String() string {
 	str := "HashSet\n"
 	items := []string{}
-	for k, _ := range set.items {
+	for k := range set.items {
 		items = append(items, fmt.Sprintf("%v", k))
 	}
 	str += strings.Join(items, ", ")