diff --git a/build/CODESIGNING.md b/build/CODESIGNING.md
new file mode 100644
index 000000000..e8b109b52
--- /dev/null
+++ b/build/CODESIGNING.md
@@ -0,0 +1,52 @@
+# CODESIGNING
+
+To sign Processing on Mac OS we need a Apple Developer account and involves two steps:
+
+Signing the Processing.app and the included JRE
+
+This happens either by running `ant macos-dist` or in the Github actions
+
+## Setup Github Actions
+To setup the Github Actions you need to be the Account Holder on your Apple Developer team.
+
+### Application Signing
+We start by creating a .p12 file following the tutorial on the CodeSigning Action
+https://github.com/Apple-Actions/import-codesign-certs
+
+Currently this consists of following this tutorial:
+
+https://calvium.com/how-to-make-a-p12-file/
+NOTE: In the create new certificate section, select `Developer ID Application` this allows the certificate to distribute outside the Mac App Store
+
+Then take the certificate generated by the tutorial above and copy it to your clipboard as
+```bash
+$ base64 -i CertificateFile.p12 | pbcopy
+```
+
+and set the secrets into the Github Repository.
+
+This will allow the action to sign Processing and the JRE
+
+### Notarisation
+
+To prevent the *this application is not recognised by Mac OS* error we need to setup the Github Action to upload the release to Apple for Notarisation
+
+Go to https://developer.apple.com/account to find the team id in the membership details section and apply it to the `PROCESSING_TEAM_ID` secret
+
+Enter your apple id email in the `PROCESSING_APPLE_ID` secret, this account does **not** need to be an account holder, ideally it is not anyone's personal apple id
+
+Follow these instructions https://support.apple.com/en-us/102654 to setup an app-specific password for the apple id and enter that as `PROCESSING_APP_PASSWORD`
+
+### Release
+
+Finally create a release to test the signing actions
+## Sign locally
+
+- Be on a MacOS computer
+- Be logged into your Apple ID
+- Setup and Log into XCode
+- cd into the repository
+
+```bash
+$ PROCESSING_TEAM_ID=... PROCESSING_APPLE_ID=... PROCESSING_APP_PASSWORD=... ant macos-dist 
+```