diff --git a/README.md b/README.md
index 85f8bb00e..32216bda6 100755
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ If you're looking for a maintained fork of OneeChan, try
 https://github.com/Nebukazar/OneeChan
 
 ## [Install](https://ccd0.github.io/4chan-x/builds/4chan-X.user.js) (Firefox)
-Install [Greasemonkey](https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/versions/2.1), then click the link above to install.
+Install [Greasemonkey](https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/), then click the link above to install 4chan X. If you are using Firefox 29 or earlier, you should use [Greasemonkey 1.15](https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/versions/#version-1.15).
 
 **Important**: If you are using Greasemonkey 2.0, you should update to the [latest version](https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/). Otherwise you may be subject to a [bug](https://github.com/greasemonkey/greasemonkey/issues/1938), fixed in version 2.1, which prevents Greasemonkey from updating 4chan X and other userscripts to the latest version. After doing so, you may want to update 4chan X manually since it is likely to be out of date.
 
@@ -46,6 +46,9 @@ New features and non-urgent bugfixes are released on the beta channel for furthe
 
 If you want to install the current beta version but get updates from the stable channel after that, install it from [here](https://github.com/ccd0/4chan-x/raw/beta/builds/4chan-X.user.js) for Firefox or [here](https://github.com/ccd0/4chan-x/raw/beta/builds/4chan-X.crx) for Chromium.
 
+## Security note
+4chan X currently shares your settings and post history between the HTTP and HTTPS versions of 4chan. If you are concerned about protecting your privacy against a man-in-the-middle attack, you should disable 4chan X on the HTTP version of 4chan and/or install [HTTPS Everywhere](https://www.eff.org/https-everywhere).
+
 ## More information
 ### [Source Code](https://github.com/ccd0/4chan-x)
 ### [Frequently Asked Questions](https://github.com/ccd0/4chan-x/wiki/Frequently-Asked-Questions)