diff --git a/str.go b/str.go
index c77b0e7..72c8661 100644
--- a/str.go
+++ b/str.go
@@ -64,8 +64,8 @@ func SkipLine(s string, n int) string {
 	return Skip(s, "\n", n)
 }
 
-// get a map keys as array.
-func MapKeys(imap interface{}) (keys []string) {
+// get a map's keys as array.
+func MapsKeys(imap interface{}) (keys []string) {
 	switch imap.(type) {
 	case map[string]string:
 		m := imap.(map[string]string)
@@ -83,9 +83,9 @@ func MapKeys(imap interface{}) (keys []string) {
 	return keys
 }
 
-// get a map keys and join to string.
-func KeysString(imap interface{}) string {
-	keys := Keys(imap)
+// get a map's keys and join it to string.
+func MapsKeysString(imap interface{}) string {
+	keys := MapsKeys(imap)
 	return strings.Join(keys, ",")
 }