diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c18f83..d9c5701 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 CHANGELOG
 ====
 
+## v1.6.0
+* change programming interfaces
+  - BBcTransaction and its child classes provide utility methods to create objects.
+
 ## v1.5.1
 * remove dependency on libbcsig
   - all key manipulation and sign/verify functions become golang native
diff --git a/README.md b/README.md
index b1e2520..a039486 100644
--- a/README.md
+++ b/README.md
@@ -12,9 +12,9 @@ This reposigory is originally from https://github.com/quvox/bbclib-go
 
 ### Features
 * Support most of the features of py-bbclib in https://github.com/beyond-blockchain/py-bbclib
-    * BBc-1 version 1.5
+    * BBc-1 version 1.6
     * transaction header version 1 and 2.
-* Go v1.10 or later
+* Go v1.12 or later (need go mod)
 
 ## Usage
 
diff --git a/example/main.go b/example/main.go
index e14f476..f7e4fa4 100644
--- a/example/main.go
+++ b/example/main.go
@@ -2,8 +2,8 @@ package main
 
 import (
 	"fmt"
-	//"github.com/beyond-blockchain/bbclib-go"
-	"main/bbclib"
+	"github.com/beyond-blockchain/bbclib-go"
+	//"main/bbclib"
 	"io/ioutil"
 	"time"
 )