diff --git a/MBCPApp/mbsig/README.md b/MBCPApp/mbsig/README.md
new file mode 100644
index 0000000..0ead9f9
--- /dev/null
+++ b/MBCPApp/mbsig/README.md
@@ -0,0 +1,5 @@
+# Notice 
+
+`mbsig.apk` and `mblitesig.apk` are only contain the APK signature scheme of original MB Bank / MB Lite app, which is used after repacking APK to make patched app works. it's NOT closed-source part.
+
+- The closed source part is whole original MB Bank app and MT Manager (which used to preserve APK signature scheme V2/V3), while MBCPApp Patcher which patches original MB Bank open source.
\ No newline at end of file