diff --git a/aesjni/src/main/cpp/checksignature.h b/aesjni/src/main/cpp/checksignature.h
index 60b1898..fd24b78 100644
--- a/aesjni/src/main/cpp/checksignature.h
+++ b/aesjni/src/main/cpp/checksignature.h
@@ -11,7 +11,9 @@
 
 //合法的APP包名
 static const char *app_packageName = "com.androidyuan.aesjniencrypt";
-//合法的hashcode -625644214:这个值是我生成的这个可以store文件的hash值
+
+//this value is generated by com.androidyuan.aesjni.SignatureTool.java.
+//-625644214 is hash of keystore file.
 static const int app_signature_hash_code = -625644214;
 
 /**
diff --git a/aesjni/src/main/java/com/androidyuan/aesjni/SignatureTool.java b/aesjni/src/main/java/com/androidyuan/aesjni/SignatureTool.java
index f59caf2..547409e 100644
--- a/aesjni/src/main/java/com/androidyuan/aesjni/SignatureTool.java
+++ b/aesjni/src/main/java/com/androidyuan/aesjni/SignatureTool.java
@@ -7,6 +7,8 @@
 
 /**
  * Created by wei on 16-12-4.
+ * Please use this class to read hash of the current apk signature file, and then copy the hash to checksignature.h;
+ * 请您使用这个类读取当前apk签名文件的hash值，然后拷贝hash写入到checksignature.h;
  */
 
 public class SignatureTool {