diff --git a/1.6-Firefox-Android.md b/1.6-Firefox-Android.md
index 830dd3b..3aa2aca 100644
--- a/1.6-Firefox-Android.md
+++ b/1.6-Firefox-Android.md
@@ -99,6 +99,7 @@ user_pref("general.aboutConfig.enable", true); // unblock about:config in newer
 
 - The script sets a function called `user_pref` so wherever that appears in the rest of the code (ie in the part from your `user.js`) that function is called to set the user preference. Any code for preferences that are commented out will not be run. If a preference name does not exist or is mistyped it will still be created without any warnings.
 - Use `Display` (Ctrl+L) to run the javascript as it adds a result message in a comment after the script, which will say "undefined" or show errors.
+  - if you get a `ReferenceError: user_pref is not defined`, reload about:config on the phone and then run the script again
 - Also click the `Console` button to look for any other error messages.
 - If errors occur on a line, the script might have stopped at that line, and you will need to correct the error in the code and re-run.
 - Check your Android Firefox `about:support` and `about:config pages` for your modified preferences, and see if the `_user.js.parrot` preference is showing success.