diff --git a/build.py b/build.py
index d92c0801a..f0131ad27 100755
--- a/build.py
+++ b/build.py
@@ -469,6 +469,7 @@ def main():
                 if pa:
                     os.system('''
     # buggy: rcodesign sign ... path/*, have to sign one by one
+    # install rcodesign via cargo install apple-codesign
     #rcodesign sign --p12-file ~/.p12/rustdesk-developer-id.p12 --p12-password-file ~/.p12/.cert-pass --code-signature-flags runtime ./target/release/bundle/osx/RustDesk.app/Contents/MacOS/rustdesk
     #rcodesign sign --p12-file ~/.p12/rustdesk-developer-id.p12 --p12-password-file ~/.p12/.cert-pass --code-signature-flags runtime ./target/release/bundle/osx/RustDesk.app/Contents/MacOS/libsciter.dylib
     #rcodesign sign --p12-file ~/.p12/rustdesk-developer-id.p12 --p12-password-file ~/.p12/.cert-pass --code-signature-flags runtime ./target/release/bundle/osx/RustDesk.app