diff --git a/README.md b/README.md
index ecf1ad3..463d8a9 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,9 @@ Options:
     -encrypt        Encrypts the zip file with gpg symmetric encryption using your vault password
     -verbose        Show verbose information
 ```
+
+
+# GPG Signature
+The [bitwardenBackup.ps1](bitwardenBackup.ps1) script has stored values of file hashes of all the files in the lib folder. If any are different, the script will exit and inform you.
+
+The bitwardenBackup.ps1 script is signed with my [GPG key](https://johnhgaunt.com/public.key) to ensure integrity. This should be check before each run to make sure this script was not tampered with and all file hashes match. 
\ No newline at end of file