Added a note to step 4 to avoid wasting time troubleshooting error

Home.md

@@ -9,6 +9,7 @@ To enable support for Blizzard Authenticator keys in Aegis follow these steps:
 2. Get serial number and restore code from app
 3. Install [python-bna](https://github.com/jleclanche/python-bna) by cloning the repo and installing locally with `pip3 install --user -e .` or install it by using the command `pip3 install bna`
 4. Restore authenticator with `bna restore --set-default $SERIAL $CODE`
+   note: Make sure that the serial is entered without spaces
 5. Get secret with bna show-secret and manually add it to Aegis (SHA1, 8 Digits) or produce an image with qrencode using the command `bna show-url | qrencode -o ~/Desktop/bnet.png` and scan the image in Aegis
 6. Verify that both authenticators give the same code and after that uninstall Blizzard Authenticator. It is recommended to delete the key from python-bna since the config file can be easily read and keys stolen. The config is stored in `~/.config/bna/bna.conf`