diff --git a/4.1-Extensions.md b/4.1-Extensions.md
index 96d7d88..218e843 100644
--- a/4.1-Extensions.md
+++ b/4.1-Extensions.md
@@ -18,5 +18,4 @@ Borrowed from [MozillaZine: Custom headers](http://kb.mozillazine.org/Custom_hea
    `user_pref("mail.identity.id1.header.References", "References: <2ad46d80-c8ce-49a3-9896-16171788ac28@example.tld>\n <31ff00c2-b7cb-4063-beeb-a0bdd424c3a7@example1.tld>");`
 5. Set the `In-Reply-To:` ie `user_pref("mail.identity.id1.header.InReplyTo", "In-Reply-To: <31ff00c2-b7cb-4063-beeb-a0bdd424c3a7@example1.tld>");`
 6. Restart Thunderbird and send your email.
-7. Comment out the above set options in your `user.js` with `/* */` and uncomment: the area to reset the values: `user_pref("mail.identity.id1.headers", "");`, `user_pref("mail.identity.id1.header.References", "");` and `user_pref("mail.identity.id1.header.InReplyTo", "");` restart Thunderbird.
-
+7. Comment out the above set options in your `user.js` with `/* */`. Go back into about:config ie (Edit → Preferences → Advanced → General → Config Editor) and rightclick on the keys `mail.identity.id1.headers`, `mail.identity.id1.header.References` and `mail.identity.id1.header.InReplyTo` and click *Reset*. Do not set these values to anything else in a `user.js`, because it will interfere with Thunderbird's normal behavior when you click Reply on an email.